36 free tools · No account required
Free Developer Tools for Code, Data & Debugging
Inspect a token, format structured data, convert timestamps, or investigate a browser network capture. These utilities help with individual debugging steps; a successful decode or format check does not prove that data is trustworthy or an application is secure.
Choose your tool
Password Crack Time & Entropy Calculator
Compare sample password strength, character-pool entropy, and estimated brute-force crack times at four illustrative guessing speeds.
Open tool →Multi-Layer CSS Shadow & Glassmorphism Studio
Design smooth multi-layer box shadows and frosted glassmorphism card styling with instant Vanilla CSS and Tailwind code export.
Open tool →HAR File Viewer & Network Waterfall
Inspect HTTP Archive HAR files exported from DevTools with waterfall timelines, MIME filters, status code breakdowns, and payload drawers.
Open tool →Source Map Un-Minifier & Tree Explorer
Unpack production JavaScript source maps, explore reconstructed source directories, inspect original unminified files, and download as ZIP.
Open tool →Visual Docker Compose Generator
Visually orchestrate multi-container Docker applications with pre-configured templates, port mapping, persistent volumes, and valid YAML export.
Open tool →Image Steganography & Secret Concealer
Hide confidential text messages and files inside images using Least Significant Bit LSB encoding and hardware-accelerated AES-GCM encryption.
Open tool →TOTP 2FA Authenticator & Token Generator
Generate TOTP codes from a Base32 secret, setup link, or QR image. Choose SHA-1/256/512, six or eight digits, and optional encrypted saving.
Open tool →PGP Keypair Generator & Encrypter
Generate RSA and Curve25519 PGP keypairs, encrypt or decrypt armored messages, and create or verify digital signatures client-side.
Open tool →Sprite Sheet Texture Packer & Atlas Studio
Pack multiple PNG sprites into compact power-of-two texture atlases using MaxRects bin-packing with Phaser, PixiJS, and CSS coordinate export.
Open tool →Normal Map & Bump Map Generator
Convert flat 2D textures and heightmaps into tangent-space normal maps with Sobel gradient filters, invert Y controls, and 3D lighting preview.
Open tool →Web Font Converter (TTF, OTF, WOFF, WOFF2)
Convert desktop TTF and OTF fonts to compressed WOFF2 and WOFF web formats bidirectionally using WebAssembly with live typography preview.
Open tool →Smart SVG to React / Next.js Component & Tailwind Styler
Convert SVG markup into a React component starting point and review its attributes before adding it to your project.
Open tool →Code Snippet to Beautiful Image Exporter
Style a code snippet as a shareable image for documentation, presentations or technical posts.
Open tool →HTML Entity Encoder & Decoder
Convert text characters to HTML entities or decode entity references for markup and content workflows.
Open tool →CSS Minifier & Formatter
Compact or reformat CSS text for easier inspection and smaller stylesheet source files.
Open tool →JSON Formatter, Validator & Fixer
Format JSON into readable, indented text and find syntax errors. Check the result before copying; valid JSON syntax does not guarantee valid application data.
Open tool →JWT Token Inspector & Decoder
Decode a JSON Web Token’s header and payload to inspect claims without treating the decoded text as verified authentication.
Open tool →Regex Tester & Pattern Matcher
Test a regular expression against sample text and inspect matching behavior using JavaScript regex syntax.
Open tool →Cryptographic Hash Generator (MD5, SHA-256, SHA-512)
Calculate supported digests for text or files and compare a result with an expected checksum.
Open tool →UUID / GUID & Random ID Generator
Generate random identifiers for application records, fixtures and other workflows that need UUID-style values.
Open tool →Base64 Text & URL Encoder / Decoder
Encode UTF-8 text as Base64 or decode Base64 back to text in your browser. See examples for plain text and accented characters. Encoding is not encryption.
Open tool →URL & URI Component Encoder / Decoder
Percent-encode a URL query value or path component, or decode it back to text. Check examples for spaces, ampersands and plus signs before copying the result.
Open tool →Text & Code Diff Compare Checker
Place two text versions side by side to review edits and inspect the differences supported by the current view.
Open tool →SQLite Database & SQL Query Runner
Inspect a local SQLite database and run supported queries against its in-browser copy.
Open tool →Timestamp & Time-Zone Meeting Converter
Convert Unix timestamps in seconds or milliseconds to a readable date, or convert a date to Unix time. Compare UTC and supported time zones in your browser.
Open tool →Markdown Editor & Live HTML / PDF Previewer
Write Markdown, inspect the supported live preview and export HTML or use your browser’s print workflow.
Open tool →JSON ↔ YAML Bidirectional Converter
Convert supported structured data between JSON and YAML, then review scalar types and nesting in the result.
Open tool →JSON to TypeScript & Zod Schema Generator
Use a JSON example to draft TypeScript types or a schema starting point, then review the inferred structure.
Open tool →Cron Expression Parser & Schedule Explainer
Inspect a cron expression and review the schedule behavior supported by this parser before configuring a job.
Open tool →Excel to SQL & SQLite Converter
Turn tabular spreadsheet data into SQL statements or a SQLite database for a local data workflow.
Open tool →SQLite Database to Excel & CSV
Read supported SQLite data and export tabular results for a spreadsheet or CSV-based workflow.
Open tool →JSON to CSV & TSV Converter
Convert JSON records to delimited text for spreadsheet imports and other row-based data workflows.
Open tool →SQL Formatter & Prettifier
Format SQL query text for easier reading and review without connecting to your database.
Open tool →Mock & Fake Data Generator
Create synthetic sample records for interface prototypes, development tests and import experiments.
Open tool →JSON & CSV Data Diff Checker
Compare supported structured datasets and inspect added, removed or changed values without uploading them.
Open tool →Chmod Permissions Calculator
Build Linux file permissions with an interactive checkbox matrix. Convert octal values into symbolic permissions and copy a chmod command without running it.
Open tool →
Which developer utilities tool should I use?
Inspect an unfamiliar value
Decode JWT fields, hashes and timestamps using the appropriate tool. Read timezone and encoding labels before comparing outputs.
Debug files and requests
Use a diff for changed text, a HAR viewer for a captured request history, or a source-map explorer for supplied maps. Remove secrets before sharing debugging artifacts.
Prepare code or configuration
Generate a starting configuration, format JSON, or test an expression against sample cases. Review generated output before applying it to a production system.