GluePuddingTool
Free online tools, no installation needed
Crypto
View MoreTOTP Two-Factor Code Generator
Generate TOTP two-factor authentication codes online. Enter or randomly generate a Base32 secret and the tool shows the code for the current time window plus the previous and next ones, matching apps like Google Authenticator.
Password Strength Analyzer
Analyze password strength online. Type a password and see its strength rating (weak, fair, strong or very strong) in real time, along with concrete suggestions such as adding length, uppercase letters, digits or special characters.
HTTP Basic Auth Generator and Decoder
Generate and decode HTTP Basic Auth headers online. Enter a username and password to build a standard Authorization header, or paste an existing header to recover the username and password behind it.
Text Hash Calculator
Online text hash calculator that computes MD5, SHA-1, SHA-256 and SHA-512 digests for your input at once, with output in hexadecimal, Base64, Base64url or binary.
Bcrypt Hash Generator and Verifier (Demo)
Online bcrypt-style hash generator and verifier for learning purposes. Generate a simplified bcrypt-style hash from a password, verify a password against a hash, and generate random test passwords. For demonstration only, not for production password storage.
AES Text Encryption and Decryption
Online AES-GCM text encryption and decryption tool. Enter text and a key of at least 8 characters to encrypt, then decrypt with the same key. Built on the browser's native Web Crypto API and computed entirely locally.
Argon2 Hash Generator
Online Argon2 password hash generator supporting argon2i, argon2d and argon2id with adjustable memory, iteration and parallelism parameters, plus built-in verification. Output follows the PHC string format.
BIP39 Mnemonic Generator
Online BIP39 mnemonic generator producing 12-word or 24-word phrases from the standard BIP39 word list. Intended for learning and testing how wallet mnemonics work, explicitly not for storing real asset keys.
HMAC Generator
Online HMAC message authentication code generator. Enter a message and key, choose SHA-256, SHA-1, SHA-512 or MD5, and see the HMAC computed in real time for API request signing and message integrity checks.
AES Encryption Tool
Online AES encryption and decryption tool supporting AES-128, AES-192 and AES-256 across ECB, CBC, CTR and GCM modes, with PKCS7/PKCS5 or no padding and Base64 or Hex input and output.
Converter
View MoreUnix Timestamp Converter
Convert between Unix timestamps and human-readable date-times online, with automatic detection of second, millisecond, microsecond and nanosecond precision, worldwide time zones including daylight saving handling, Windows FILETIME and C# Ticks conversion, and quick date-range shortcuts.
Base32 Encoder and Decoder
Encode text to Base32 and decode it back in real time, using the RFC 4648 alphabet. Text is handled as UTF-8 bytes, so non-ASCII characters round-trip correctly.
CSV to Markdown Table
Convert CSV, TSV and other delimited data into Markdown tables instantly. Supports custom delimiters, header detection and per-column alignment, with live preview and HTML output.
SRT to VTT Subtitle Converter
Convert subtitles between SRT and WebVTT in both directions, handling timestamp separators, cue numbering and the WEBVTT header automatically, with errors reported down to the individual subtitle block.
Base58 Encoder and Decoder
Convert text to and from Base58 using the Bitcoin alphabet, which omits the easily confused characters 0, O, I and l.
JSON to YAML Converter
Convert JSON data to YAML online. Paste JSON and the equivalent YAML appears instantly, with support for objects, arrays and nested structures, making it handy for configuration file conversion.
YAML to JSON Converter
Convert YAML data to JSON online with a configurable indent width. Paste YAML and the formatted JSON appears instantly, useful for configuration file conversion.
JSON to TOML Converter
Convert JSON data to TOML online. Paste JSON and the corresponding TOML configuration text appears instantly, suited to writing and migrating files such as Rust's Cargo.toml and Python's pyproject.toml.
TOML to JSON Converter
Convert TOML configuration into JSON online. Paste content from Cargo.toml, pyproject.toml or any other TOML file and get the equivalent JSON text instantly, ready for tooling that only understands JSON.
JSON to XML Converter
Convert JSON data into XML online. Paste a JSON object and get the matching XML tag structure, with special characters escaped automatically for legacy system and SOAP integrations.
Web
View MoreSQL Formatter
Format SQL statements online. The tool breaks a one-line query into readable lines by inserting a line break before keywords such as SELECT, FROM, WHERE, JOIN and ORDER BY, making long statements much easier to read.
Markdown to HTML Converter
Convert Markdown text to HTML online. Supports heading levels one to three, bold, italic and line breaks, with Markdown on the left, a live rendered preview on the right, a source view and one-click copying.
TOML to YAML Converter
Convert TOML configuration to YAML online. Paste TOML content such as a Cargo.toml or pyproject.toml snippet and the equivalent YAML text appears instantly, which is handy for migrating configuration formats.
YAML to TOML Converter
Convert YAML data to TOML online. Paste a YAML mapping and the equivalent TOML text appears instantly, which is useful when writing Cargo.toml, pyproject.toml or migrating configuration to TOML.
XML Formatter
Format XML online. Paste XML that has been squeezed onto one line or badly indented and the tool re-indents it by tag nesting level as you type, ideal for tidying API responses and configuration files.
YAML Formatter and Validator
Validate and format YAML online. The tool checks your YAML syntax as you type, reports parse errors, outputs a normalized version with consistent indentation, and offers a JSON view of the same data.
HTML WYSIWYG Editor
Edit rich text visually and export the HTML. The toolbar offers bold, italic, underline, strikethrough, headings, lists and links, and the generated HTML source updates live and can be copied with one click.
MIME Types Cheat Sheet
Look up MIME types online. The cheat sheet lists 33 common file extensions with their MIME types, supports searching by extension, MIME type or description, and copies any value with a single click.
JSON Diff Tool
Compare two JSON documents online. The tool walks every level recursively and lists added, removed and changed keys with their exact paths, treating arrays as single values, which suits API responses and configuration checks.
JSONL Viewer
View and inspect JSON Lines data online. Paste or upload a .jsonl file, parse it line by line, search the list on the left to find a record, and read the selected line as a collapsible, syntax-highlighted tree on the right, with unparsable lines flagged.
Network
View MorePeer-to-Peer File Transfer (LAN and Internet)
Send files straight from one browser to another over WebRTC. The file travels peer to peer instead of through a server, and the two sides pair up with a short code.
DNS Record Lookup Command Builder
Pick a DNS record type and domain to generate dig/nslookup/host commands and online lookup links in one click, plus a 16-type DNS record reference table — the tool itself performs no live DNS lookups.
MAC Address Vendor Lookup
Look up the manufacturer behind a MAC address using the IEEE OUI database. Accepts colon, hyphen, and unseparated formats, supports batch lookups, and distinguishes local from globally unique addresses.
Random Port Number Generator
Generate random port numbers from the well-known, registered, dynamic, or a custom range. Produces multiple deduplicated ports at once and flags commonly occupied ports so you avoid conflicts.
Text
View MoreTraining Needs Assessment Form Generator
Generate a standardized training needs assessment form online. Fill in department and position, check training areas, set high/medium/low priorities, then copy or download the result as a TXT file. Built for HR annual training planning and department-level needs surveys.
Labor Contract Expiry Tracker
Enter employee name, contract start date and duration to get the expiry date, days remaining and a four-level alert (expired / within 30 days / within 90 days / normal). Supports single entry and batch paste, helping HR renew contracts on time.
Annual Review Template Generator
Pick performance dimensions and set weights to generate a complete performance review form with scoring tables, self-assessment, manager comments and an overall rating. Supports annual, semi-annual and quarterly cycles, with copy and TXT download.
HS Code Lookup Reference
A 2-digit HS chapter code reference covering 21 sections and 97 chapters, with category browsing and keyword search with highlighting — a practical first step for classifying cross-border products.
Product Listing Score Analyzer
Score your e-commerce listing across 9 weighted dimensions — title, keywords, images, bullets, description, A+ content, video and reviews — on a 100-point scale, with tailored improvement suggestions.
Random Group Generator
Split a list of names into random groups online. Enter names by hand, paste a whole roster, or import an Excel/CSV file, then divide by number of groups or by group size and copy or export the result as CSV.
Import/Export Document Checklist Generator
Select trade direction, mode of transport, destination country/region and product type to auto-generate a matching checklist of import/export documents and requirements, ready to copy.
AI Prompt Template Library
A library of 39 ready-to-use prompt templates across 9 categories - writing, coding, data analysis, translation, creativity, marketing, education, office work, and interviews - with variable filling and one-click copy.
AI Ethics Checklist Generator
Generate a structured AI ethics checklist by application type, region and risk level, covering data privacy, fairness, transparency, security, human oversight and content safety.
Meeting Agenda Generator
Generate a structured meeting agenda with an automatic timeline, participants and per-item durations, exportable as plain text or Markdown.
Data
View MoreShift Schedule Generator
Enter employee names and shift types to auto-generate a multi-day rotating shift schedule with staggered rotation, copyable in one click.
Random Chinese Address Generator
Generate random mainland China addresses online. Pick one of 15 provinces or choose random, generate up to 50 addresses at a time and copy them with a click, for use as test or placeholder data.
Test Bank Card Number Generator
Generate Luhn-valid bank card numbers for development and testing, covering Visa, Mastercard, American Express and UnionPay prefixes. The numbers are randomly generated and are strictly for testing - they are not real cards and cannot be used for any real transaction.
Barcode Generator
Generate nine common 1D barcode formats online, including CODE128, EAN-13 and UPC-A, with adjustable bar width and height, an optional human-readable line, and SVG download.
JSON Formatter and Validator
Online JSON formatter and validator. Format JSON into readable indented text or minify it to a single line, with live syntax validation that reports the exact parsing error.
JSON Prettifier
Beautify or minify JSON, with support for relaxed JSON5 syntax such as comments, trailing commas, single-quoted strings, and unquoted keys. Output is always standard JSON.
JSON Minifier
Online JSON minifier that strips spaces, line breaks, and indentation to produce the smallest single-line JSON, then reports the size before and after along with the percentage saved.
Math
View MoreIndustry Salary Benchmark Lookup
Look up 25th/50th/75th percentile monthly and annual salary benchmarks by industry, city tier, and job level.
Annual Leave & Time-Off Balance Calculator
Calculates statutory paid annual leave by tenure, then combines company extra leave, days already taken, and overtime comp hours into a total remaining leave balance.
Recruitment Cost & ROI Calculator
Aggregates agency fees, job board fees, referral bonuses, plus HR and interviewer time cost into total and per-hire recruitment cost with a breakdown.
Employee Turnover Rate Calculator
Calculates employee turnover rate by month, quarter, or year, separates voluntary from involuntary departures, and gives an annualized health rating.
Headcount Planning Calculator
Estimate required headcount from annual business volume and per-capita output, compare it with current staffing to find the gap, and estimate labor cost with optional average salary and budget cap. Built for HR headcount planning and hiring proposals.
Compensation Structure Builder
Enter base salary, performance base, performance coefficient, allowance and bonus months to instantly see monthly pay, annual pay, year-end bonus, component ratios and an estimated social insurance deduction, making compensation plan design and comparison easy.
Multi-Currency Exchange Rate Calculator
A free exchange rate calculator for 10 major currencies used in cross-border e-commerce. Reference rates are built in and fully editable, with single and batch conversion plus automatic cross-rate calculation.
VAT Calculator
Online VAT calculator for converting between net and gross amounts in both directions, with built-in 13%, 9%, 6%, 5%, 3% and 1% rates, optional surtax calculation and a batch mode.
Social Insurance Base Calculator
Enter your monthly salary and city to calculate the social insurance contribution base, including floor and ceiling handling, then see employer and employee contributions for pension, medical, unemployment, work injury and maternity insurance plus the housing fund, with adjustable rates.
Marketplace Fee Comparison Calculator
Compare fees, net income and profit margins across Amazon, eBay, Etsy, Shopify, AliExpress, Shopee and Temu. Enter price and cost, pick platforms, and see the best option highlighted automatically.
Measurement
View MoreInternational Shipping Time Estimator
Estimate cross-border shipping times across express, air, sea, rail and line shipping on major routes between 8 origin and 12 destination countries, with peak-season delays and latest arrival dates by business day.
Online Stopwatch
An online stopwatch accurate to the millisecond, with start, pause and resume, lap recording and reset. Each lap shows both the elapsed total and the gap since the previous lap.
Product Carbon Footprint Calculator
Enter product type, material, packaging, manufacturing energy use and transport mode to quickly estimate a per-unit carbon footprint using a simplified EEIO plus material-factor model — not a formal LCA report.
JavaScript Benchmark Builder
Compare the performance of two JavaScript snippets online. Paste code A and code B, run each of them repeatedly for a chosen duration, and see the operations per second (ops/s) plus which version is faster and by how much.
Device and Browser Information Viewer
See detailed information about your current device and browser online. The page detects your browser and operating system and shows screen resolution, color depth, device pixel ratio, viewport size, touch points, CPU core count and more.
Webcam Video Recorder
Record video from your webcam directly in the browser. The tool captures camera and microphone with a live preview, records with one click and lets you download the finished video file, with all processing done locally.
Keyboard Key Code Finder
Find the JavaScript key codes of any keyboard key online. Click the capture area and press a key to instantly see its key value, code value, numeric keyCode and the state of the Ctrl, Shift, Alt and Meta modifiers.
Angle Unit Converter
Convert between angle units online. Enter a value in degrees, radians, gradians, arcminutes, arcseconds, quadrants or compass points and the tool instantly lists the equivalent value in every other unit.
Area Unit Converter
Convert between 13 area units online, from square millimeters up to square kilometers, including ares, hectares, acres and the Chinese mu. Enter one value and every other unit is calculated in real time.
Conference Call Time Converter
Pick a base city and meeting time, instantly see local times across 23 major cities such as Beijing, New York, London and Tokyo, and find common working hours.
Dev
View MoreRegular Expression Cheat Sheet
A quick reference of commonly used regular expressions covering 18 everyday cases such as email, phone number, URL, IP, ID card number and date, each with an explanation, plus keyword search and one-click copy.
LLM Temperature & Top-P Sampling Visualizer
An interactive visualization using 12 built-in mock token probabilities that shows how temperature and top-p (nucleus sampling) reshape an LLM's output distribution - a local simulation, not a real model call.
Text Embedding Similarity Playground
Enter one query sentence and up to 10 candidate sentences to compute and rank similarity scores using three lexical-overlap methods - Jaccard, cosine (bag-of-words), and simplified TF-IDF - a demo of the concept, not a real embedding model.
LangChain Prompt Template Builder
Visually build a LangChain ChatPromptTemplate with System/Human/AI messages, variable placeholders and few-shot examples, and generate copy-ready Python or JavaScript code.
Model Evaluation Metrics Explainer
Quick reference for ML and LLM evaluation metrics - BLEU, ROUGE, F1, pass@k, BERTScore and more - with formulas, ranges and use cases, plus an interactive confusion matrix calculator.
Vector Dimension Comparison
Compare vector dimensions, context length, MTEB scores and prices of mainstream embedding models, with filtering and sorting, plus storage estimation for millions of text chunks.
MCP Server Boilerplate Generator
Generate ready-to-use TypeScript or Python MCP server skeleton code from your server info and tool definitions, right in the browser.
WebAssembly Module Size Estimator
Estimate the min/typical/max size range of a WebAssembly module based on source language, compile target, optimization level, and selected feature modules — a heuristic estimate, not a real file analysis.
WebRTC STUN/TURN Config Builder
Visually add STUN/TURN servers and ICE options, then generate ready-to-use RTCConfiguration JavaScript code and a JSON config file.
GraphQL Subscription Builder
Visually define a GraphQL subscription's name, arguments, and return fields, and generate the subscription query plus WebSocket connection sample code — no real connection is made in the browser.
Hardware Detection
View MorePCB Gerber Layer Reference Viewer
Lists the standard Gerber file layers required for 2/4/6/8-layer PCBs, marking required vs. optional files and naming conventions to help engineers verify fabrication packages.
Transmission Line Impedance Calculator
Calculates PCB microstrip and stripline characteristic impedance using IPC-2141 formulas, and compares the result against common 50/75/90/100Ω targets.
I2C Pull-up Resistor Calculator
Calculates a compliant I2C pull-up resistor range and recommended value based on bus speed mode (Standard/Fast/Fast-plus), supply voltage, and bus capacitance.
Heatsink Thermal Resistance Calculator
Calculates the required heatsink thermal resistance (Rθsa) from a device's maximum junction temperature, ambient temperature, power dissipation, and junction-to-case/case-to-sink resistances, with heatsink recommendations.
Op-Amp Gain Calculator
Calculates gain (in V/V and dB) and output voltage for five basic op-amp circuit configurations: non-inverting, inverting, differential, voltage follower, and non-inverting summing amplifier.
Buck-Boost Converter Design Calculator
Calculates duty cycle, minimum inductance, current ripple, peak current, and output capacitance for Buck, Boost, and Buck-Boost switching converter topologies.
Antenna Length Calculator
Calculates wavelength and physical antenna length for quarter-wave, half-wave, full-wave, and 5/8-wave antenna types from operating frequency, with velocity factor adjustment and common RF band presets.
ADC Resolution Calculator
Enter ADC bit depth and reference voltage to calculate LSB voltage, quantization error, and dynamic range (dB), with bidirectional conversion between input voltage and ADC reading.
PWM Duty Cycle Calculator
Supports two calculation modes — "frequency + duty cycle → timing" and "period + high time → duty cycle" — with optional MCU clock frequency input to compute PWM resolution in bits.
Fuse Selection Calculator
Recommends fuse current rating (nearest standard value), voltage rating, and fuse type based on load type, operating voltage, and normal current, using industry derating factors, with optional inrush I²t calculation.
Image Tools
View MoreImage Cropper
Crop images online by dragging a selection box, with common aspect ratio presets and pixel-precise adjustment. Everything runs locally in your browser with no upload.
Image Compressor
Compress images in bulk online with an adjustable quality slider and an optional longest-edge limit, compare the before and after file sizes at a glance, and download everything as a ZIP.
Image Format Converter
Convert images to PNG, JPEG, WebP or BMP in bulk online. Everything is processed locally in your browser with no upload.
Image Base64 Encoder for Vision Models
Encode an image into a Base64 data URI, estimate GPT-4o image token usage with OpenAI's published tile formula, and check reference image limits for GPT-4V, Claude 3 and Gemini vision models. Everything runs locally in your browser.
Base64 Image Preview and Converter
Preview a Base64 string as an image, or turn an uploaded image into Base64, with image dimensions and data length shown alongside the result.
Image Color Picker
Upload, drag or paste an image and click anywhere on it to sample that pixel's color, with HEX, RGB and HSL values ready to copy.
Calculators
View MoreBMI Calculator
Calculate your body mass index from height and weight in either metric or imperial units, with live results showing your weight category and health advice.
Coin Flip Simulator
Flip a virtual coin online for a random heads or tails result, with a running tally of how many times each side has come up.