Developer & Data ToolsFree, Fast & Private
Encode, decode, format, validate, convert and analyze data directly in your browser.
- No registration.
- No upload.
- No data storage.
The 15 most popular tools
The utilities developers, analysts and office users reach for every day.
Base64 Encoder
Convert any text, including emoji and accented characters, into a Base64 string in one click.
Hello world
SGVsbG8gd29ybGQ=
URL Encoder
Make any text safe for a URL: spaces, accents, ampersands and emoji become %XX sequences.
https://example.com/search?q=café & bar
https%3A%2F%2Fexample.com%2Fsearch%3Fq%3Dcaf%C3%A9%20%26%20bar
SHA-256 Hash Generator
Hash any text with SHA-256 and get the 256-bit digest as hex or Base64 in real time.
- Base64 DecoderPaste a Base64 string and read the original text instantly, even when the padding is missing.
- JSON Formatter & BeautifierTurn a minified or messy JSON document into readable, consistently indented text, with a precise error message if the JSON is invalid.
- JSON ValidatorCheck whether a piece of text is valid JSON and locate the exact character where it goes wrong.
- JSON RepairPaste almost-JSON from a log, a chat answer or a JavaScript snippet and get valid JSON back, with a clear report of every change.
- JWT DecoderPaste a JWT to read its header and payload as formatted JSON, with issue, not-before and expiry times translated to real dates. Decoding is not verification.
- UUID GeneratorCreate one or thousands of universally unique identifiers in any version, formatted exactly the way your code or database expects.
- Unix Timestamp ConverterPaste an epoch value or a date and get every common representation at once: seconds, milliseconds, ISO 8601, RFC 2822, local time and relative time.
- URL DecoderTurn %20, %3A and %C3%A9 back into readable text, and find out exactly where a malformed sequence sits.
- Text Diff – Compare Two TextsPaste an original and a modified text to see exactly what was added and removed, at the level of detail you choose.
- CSV to JSON ConverterTurn CSV rows into clean JSON in one step, with typed values, custom delimiters and pretty or minified output.
- JSON to CSV ConverterPaste a JSON array and get a CSV file ready for Excel or Google Sheets, with nested data flattened into columns.
- Regex TesterWrite a pattern, paste some text and see every match highlighted, with its position and capture groups.
Tool categories
Everything is organized by task so you can find the right tool in seconds.
Developer Tools
45 tools
Encoding & Decoding
28 tools
- Base64 Encoder
- Base64 Decoder
- URL Encoder
- URL Decoder
- Base64URL Encoder
- Base64URL Decoder
- Text to Binary Converter
- Binary to Text Converter
- Text to Hex Converter
- Hex to Text Converter
- HTML Entities Encoder
- Text to ASCII Converter
- ASCII to Text Converter
- HTML Entities Decoder
- Unicode Character Inspector
- UTF-8 Byte Viewer
- + 12 more
JSON & Data
44 tools
- JSON Formatter & Beautifier
- JSON Validator
- JSON Repair
- CSV to JSON Converter
- JSON to CSV Converter
- YAML to JSON Converter
- JSON to YAML Converter
- XML to JSON Converter
- JSON to XML Converter
- XML Formatter & Beautifier
- YAML Formatter & Beautifier
- XML Validator
- YAML Validator
- JSON Minifier
- JSON Viewer
- Excel to CSV Converter
- + 28 more
Hash & Checksum
12 tools
Text Tools
25 tools
Date & Time
12 tools
- Unix Timestamp Converter
- Timestamp to Date Converter
- Date to Timestamp Converter
- Current Unix Timestamp
- UTC to Local Time Converter
- ISO 8601 Date Converter
- Local Time to UTC Converter
- Time Difference Calculator
- Date Difference Calculator
- Add or Subtract Days from a Date
- Subtract Days from Date
- Duration Converter
Network Tools
13 tools
File Tools
11 tools
Markdown & Diagrams
13 tools
Your data stays in your browser
Nearly every tool on this site runs as JavaScript inside your own browser tab. What you paste or drop into a tool is processed on your device and is never sent to our servers.
- Local processing
- Text, JSON, JWTs, CSV files and archives are processed by your browser, not by a server.
- No accounts
- There is nothing to sign up for. No login, no profile, no tracking of what you type.
- No stored content
- Inputs and files are never saved. We only remember tool names you favourite, in your own browser.
- Open-source engines
- Built on well-known open-source libraries, credited on our open-source page.
Your text or file
This browser tab
The tool runs here
Our server
Receives nothing
Frequently asked questions
Are these tools really free?
Yes. Every tool is free to use with no account, no daily limit and no watermark.
Is my data uploaded anywhere?
No. The tools run in your browser, so pasted text and dropped files stay on your device. You can verify this by using the site with your network disconnected after the page has loaded.
Can I use the tools offline?
Once a tool page has loaded, most tools keep working without a connection because the processing code is already in your browser. A dedicated offline mode is planned.
Which languages are supported?
The site is available in English, French, Spanish and Arabic (with right-to-left layout). Every tool has a localized address.
Are the results safe to rely on?
Tools follow the relevant standards, but you remain responsible for how results are used. For example, decoding a JWT does not verify its signature, and a matching hash does not prove a file is safe.