Developer Tools
JSON, Base64, JWT, hashing — the things you reach for every day
Base64 Encoder & Decoder
Encode text and files into Base64 strings, or decode Base64 back to its original content, right in your browser.
JWT Decoder
Decode and inspect JSON Web Token (JWT) headers and payloads, and check expiration status, all securely in your browser.
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files to verify integrity or create checksums.
UUID Generator
Generate standard v4 (random) or v7 (time-ordered) UUIDs for your project, right in your browser.
Unix Timestamp Converter
Instantly convert Unix timestamps (s, ms, µs) to readable dates, or convert dates back to timestamps.
ULID Generator
Generate and decode time-sortable unique identifiers (ULIDs), a modern, index-friendly alternative to UUIDs.
chmod Permissions Calculator
An interactive calculator to figure out Linux file permissions. Convert between numeric (755), symbolic (rwxr-xr-x), and checkboxes.
HTTP Status Code Dictionary
Search and browse all HTTP status codes (200, 404, 502) with practical explanations and comparison tables.
SQL Formatter
Format tangled SQL into a readable, indented layout, or minify it into a single line. Supports MySQL, PostgreSQL, and Standard SQL.
.env to JSON Converter
Convert .env files to JSON and back, with output for Docker, Kubernetes, and shell export scripts.
What are Developer Tools?
Reading an API response, cracking open a token, producing a checksum — it's daily work. What's uncomfortable is pasting company data into whatever site comes up first in search. Every tool here runs inside your browser, so a production JSON response or an auth token goes nowhere.
When you need them
- An API response is one long line and you can't see the structure
- You need to know what's inside a login token (JWT) and when it expires
- You're producing or comparing a checksum to verify a file
- You want to check that a cron expression really fires when you think it does
All Developer Tools
- Base64 Encoder & Decoder — Encode text and files into Base64 strings, or decode Base64 back to its original content, right in your browser.
- JWT Decoder — Decode and inspect JSON Web Token (JWT) headers and payloads, and check expiration status, all securely in your browser.
- SHA Hash Generator — Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files to verify integrity or create checksums.
- UUID Generator — Generate standard v4 (random) or v7 (time-ordered) UUIDs for your project, right in your browser.
- Unix Timestamp Converter — Instantly convert Unix timestamps (s, ms, µs) to readable dates, or convert dates back to timestamps.
- ULID Generator — Generate and decode time-sortable unique identifiers (ULIDs), a modern, index-friendly alternative to UUIDs.
- chmod Permissions Calculator — An interactive calculator to figure out Linux file permissions. Convert between numeric (755), symbolic (rwxr-xr-x), and checkboxes.
- HTTP Status Code Dictionary — Search and browse all HTTP status codes (200, 404, 502) with practical explanations and comparison tables.
- SQL Formatter — Format tangled SQL into a readable, indented layout, or minify it into a single line. Supports MySQL, PostgreSQL, and Standard SQL.
- .env to JSON Converter — Convert .env files to JSON and back, with output for Docker, Kubernetes, and shell export scripts.
Good to know
Every tool on Toolz, Developer Tools included, is free with no sign-up and nothing to install. Your input is processed inside the browser and never sent to or stored on a server, so it is safe to use with work data. If the tool you want isn't listed, the button below searches every category.
Other categories
Browse the rest of Toolz.