Free Private Developer Tools
70+ developer tools and references for JSON, JWT, Base64, hashes, regex, YAML, diffs, colors, cron, AI security, and data conversion.
No signup. No tool-input upload. No server-side tool processing. Your code stays on your device.
Start by developer task
Find the right BytePane tool in one click
Format, repair, or validate JSON
Use the formatter for valid JSON, the repair tool for trailing commas, single quotes, comments, Python literals, or copied AI output.
Test JavaScript regex safely
Run patterns against sample text, inspect captures and replacements, then compare against copy-paste JavaScript examples.
Inspect or create JWTs
Decode claims first, then generate signed test tokens for local authentication flows without uploading token payloads.
Validate API specs and responses
Check OpenAPI 3.0/3.1 YAML or JSON, then map response codes, redirects, errors, and rate-limit behavior.
Prepare pages for AI citation
Build an AI citation map, validate crawler access for ChatGPT, Claude, Perplexity, Grok, and search bots, then publish visible source-backed answers.
Convert data between formats
Turn API payloads into frontend types, spreadsheets, YAML, XML, Go structs, or runtime Zod schemas.
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Auto-updated from BLS & Federal Reserve · last refresh: April 25, 2026
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Popular Tools
JSON Formatter
Format, validate & beautify JSON
{}JSON Minifier
Compress JSON safely
B64Base64 Encode/Decode
Encode or decode Base64 strings
IMGImage to Base64
Convert images to data URIs
0101Text to Binary
Encode text as UTF-8 binary bytes
%20URL Encode/Decode
Encode or decode URL components
#Hash Generator
Generate MD5, SHA-256, SHA-512 hashes
JWTJWT Generator
Create signed JWT test tokens
AIPrompt Injection Scanner
Scan LLM prompts & agent inputs
APIOpenAPI Validator
Check Swagger/OpenAPI YAML
.*JavaScript Regex Tester
Test JS RegExp, captures & ReDoS hints
/re/JavaScript Regex Library
Copy-paste JS RegExp patterns
AaWord Counter
Count words, characters & sentences
<>Diff Checker
Compare two texts side by side
Color Picker
Pick colors and convert HEX/RGB/HSL
Data Converters
Code Formatters
Generators & Utilities
Developer References
100% Private
Tool processing happens in your browser. Pasted tool input is not uploaded to BytePane servers.
Instant Results
No loading spinners. Results appear as you type with zero latency.
Free Forever
No signup, no premium tier, no limits. All tools are completely free.
Developer Guides
View all articles →HTTP Status Codes Reference
Search IANA-registered codes, API response guidance, redirects, rate limits, crawler behavior, and Problem Details.
CronCron Job Syntax Guide
Five-field crontab syntax, copy-paste schedules, day-field behavior, environment pitfalls, and dialect caveats.
OpenAPIOpenAPI vs Swagger Guide
OpenAPI 3.2 versus 3.1, Swagger tooling, JSON Schema alignment, validators, renderers, and SDK codegen workflows.
AI codingAI Coding Assistants Compared
Cursor, Copilot, Claude Code, Cline, Windsurf, Aider, Continue, and team bakeoff criteria by workflow.
gRPCgRPC Cheatsheet
Proto3 services, streaming modes, grpcurl, metadata, deadlines, health checks, status codes, and load-balancing notes.
PerformanceWeb Performance Checklist 2026
Core Web Vitals, image strategy, script budgets, caching, server timing, and post-launch monitoring checks.
Frequently Asked Questions
What is BytePane?
BytePane is a free suite of 70+ developer tools and references that run entirely in your browser. Format JSON, encode Base64, test regex, generate UUIDs, convert data formats, and more — all without sending your data to any server.
Is BytePane really free?
Yes, all tools are 100% free with no premium tiers, usage limits, or sign-up requirements. BytePane is supported by non-intrusive ads and will remain free forever.
Is my data safe?
Tool processing happens client-side in your browser using JavaScript. Your pasted input is not uploaded to BytePane servers. The site may load analytics or advertising resources, but those resources do not receive tool input.
What tools does BytePane offer?
BytePane offers JSON formatter, Base64 encoder/decoder, URL encoder, hash generator, regex tester, diff checker, JWT generator and decoder, code formatters (HTML, CSS, SQL, XML, JS), data converters (JSON to TypeScript, Zod, CSV, YAML, XML, Go), and many more. See all tools.