OneToolbox - Free Online Tools
A privacy-first suite of free online browser tools including image compressor, format converter, QR code generator, text diff, and utilities.
All Tools(37)
Token Generator
Generate random passwords or tokens with custom length, formats, and characters.
Hash Text
Hash a text string using MD5, SHA1, SHA256, SHA512 and more algorithms.
Hash File
Calculate file checksums using MD5, SHA1, SHA256, SHA512 and more algorithms in parallel.
Bcrypt
Hash and salt password strings using bcrypt, and verify hashes against input strings.
UUID Generator
Generate random UUIDs (Universally Unique Identifiers) online, supporting v1, v3, v4, v5, and NIL versions.
ULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers (ULID) online as an alternative to UUID.
Text Encryption & Decryption
Encrypt and decrypt texts using symmetric algorithms like AES, TripleDES, Rabbit, and RC4.
BIP39 Mnemonic Generator
Generate BIP39 mnemonic passphrases for cryptocurrency wallets. Supports multiple languages and bidirectional entropy-mnemonic conversion.
HMAC Generator
Compute a Hash-based Message Authentication Code (HMAC) using MD5, SHA1, SHA256, SHA512 and more algorithms with a secret key.
Date & Time Converter
Convert dates and times between various formats including ISO 8601, RFC 3339, Unix timestamp, and more.
Timezone Converter
Multi-timezone comparison and conversion tool. Supports base time picker, 24-hour slider linkage, searching & adding common timezones. Perfect for global team collaboration and meeting scheduling.
Integer Base Converter
Convert integers between different bases (from base 2 to base 64).
Color Converter
Convert colors between HEX, RGB, HSL, HWB, LCH, CMYK, and CSS Name.
URL Encoder / Decoder
Encode or decode strings to be safe for URL parameters.
Device Information
View details about your current screen, browser, and device setup.
JWT Parser
Decode JSON Web Token (JWT) header and payload, parsing its claims and timestamps.
QR Code Generator
Generate QR codes with customizable error correction levels and colors, and download them with one click.
Stopwatch / Chronometer
Simple stopwatch tool with split and lap timing functionality.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer.
Text Statistics
Analyze text for character count, word count, line count, byte size, sentence count, and estimated reading and speaking times.
Text Diff
Compare and find differences between two texts line by line, word by word, or character by character with side-by-side or unified views.
JSON Prettify & Format
Prettify, format, sort keys, and adjust indent size of JSON. Supports parsing loose JSON5 format.
JSON Minify
Minify and compress JSON content, stripping formatting and whitespace. Supports parsing loose JSON5 format.
SQL Prettify & Format
Prettify, format, and beautify your SQL queries for various databases/dialects.
Kuwo Music Search
Search Kuwo music and get direct links
Netease Cloud Music Search
Search Netease Cloud Music and get direct links
QQ Music Search
Search QQ Music and get direct links
Image Compression
Secure, fast, and local image compression in your browser using WASM technology.
Image Converter
Convert images between JPG, PNG, and WebP directly in your browser.
Image Editor
Browser-based full-featured image editing tool.
Nine-Grid Image Splitter
Split an image into a 3x3 grid (9 pieces), ideal for social media posts like WeChat Moments or Instagram.
Images to GIF
Free and secure online GIF maker to combine multiple images into a high-quality animation. Pure local processing.
GIF Splitter
A purely local tool to quickly split GIF animations into individual frames. Supports transparent backgrounds and batch ZIP downloads. Data never leaves your device.
AI ID Photo Generator
Professional ID, passport, and visa photo generator powered by AI Portrait Matting.
PDF to Image
Fast, secure, and client-side PDF to image converter with high-resolution batch export.
Image to PDF
Fast, private, and client-side tool to convert and combine multiple images into a single PDF document.
PDF Watermark
Secure, fast, and client-side PDF watermark tool with real-time preview, text & image watermarks, and tiled layouts.