18+ free developer tools — Base64, JSON, API & image utilities
ToolMorph is a fast, no-signup toolkit for everyday dev work: Base64 and JWT inspection, JSON formatting and diffing, CURL-to-fetch conversion, QR codes, cron builders, image compression, regex testing, and more. Every tool runs in a calm dark UI built for long debugging sessions—local-first where possible, with dedicated pages, FAQs, and guides for each workflow.
All tools
18 browser-based utilities across encoding, JSON, security, and API workflows—pick a card to jump in.
Base64
JWT & security
Media & SEO
API & data utilities
Regex tester
Pattern, flags, live highlights — invalid regex surfaces as a clear error.
UUID generator
Cryptographically random v4 UUIDs — batch generate and copy locally.
Timestamp converter
Unix seconds or milliseconds ↔ calendar dates — local and UTC.
JSON formatter
Format, validate, or minify JSON in the browser — instant error hints.
URL encoder / decoder
Percent-encode or decode text and query values — Unicode-safe.
SHA256 / MD5 hash generator
Fingerprint strings with SHA-256 or MD5 — copy-ready hex output.
JSON diff checker
Compare two JSON objects—highlight added, removed, and changed fields.
CURL ↔ fetch converter
Convert curl, fetch, and axios snippets—preserve headers and bodies.
Cron expression generator
Visual cron builder with presets, human-readable output, and next-run preview.
ToolMorph Labs
Experimental AI tools for founders, SaaS builders and indie hackers.
Founder Roast
Paste your startup URL and get brutally honest AI feedback on your landing page.
Try it now →
Startup Idea Validator
Stress-test your startup idea before you waste six months building the wrong thing.
Landing Page Judge
Get a structured critique of your landing page copy, layout, and conversion hooks.
Browse by category
Tools are grouped into focused hubs—each with its own landing page for quicker discovery.
JSON tools
Free JSON tools in your browser: format and validate JSON, compare two payloads with a diff checker, and minify for APIs—all local, no signup.
Explore json tools →Encoding tools
Free encoding utilities: Base64 encode/decode, image ↔ Base64 converters, URL percent-encode/decode, QR code generator, and image compressor—all local, no signup.
Explore encoding tools →Security tools
Free security tools for developers: JWT decoder for header and payload inspection, bcrypt password hash generator, plus SHA-256 and MD5 digests—all computed locally in your browser.
Explore security tools →API & data tools
API-era utilities: convert curl to fetch or axios, build cron expressions, test regex, generate UUIDs, convert timestamps, and build XML sitemaps—all client-side.
Explore api & data tools →One hub, deep pages per tool
Most “developer tools” sites stack unrelated widgets on one screen. ToolMorph does the opposite: a calm landing page, then a dedicated URL for every workflow— Base64 encode, JSON formatter, CURL converter, QR generator, and more. Each page gets clear metadata, how-to steps, and FAQs so you find the exact task without wading through noise.
Encoding tools cover Base64 text and images, URL percent-encoding, and scannable QR payloads. JSON utilities help you pretty-print configs, validate syntax, and diff API responses before a deploy. Security helpers include a JWT decoder for claim inspection (decode only, not verify), plus bcrypt and hash generators for local test fixtures. API-era utilities round out the catalog: regex testing, UUID issuance, timestamp conversion, cron expression building, image compression, and an XML sitemap generator for SEO handoffs. The shared goal is local-first where possible, honest about limits, and documented well enough to trust in production debugging.
Long-form blog articles add context—what Base64 is, how JWTs work, when to inline images, and how to ship sitemaps. Tools link to guides and back again, so the site reads like a small documentation project rather than a wall of textareas.