All Developer Tools
Browse our complete collection of free, fast online tools. All processing happens in your browser.
Browse by Category
Number Base Converter — Binary, Hex, Decimal & Octal
conversion
Convert between binary, hex, decimal, octal and any base (2-36) instantly. Free, private — all processing in your browser.
Base64 Decoder & Encoder
encoding
Decode and encode Base64 online for free. Real-time conversion with full UTF-8 and emoji support. 100% private — runs in your browser. No signup needed.
Compress Images Online — JPEG, PNG & WebP
conversion
Compress JPEG, PNG & WebP up to 80% smaller — in your browser, no upload. Batch 20 images, adjust quality, compare before & after. Free & private.
JSON Diff & Compare
encoding
Compare two JSON files instantly in your browser. Side-by-side highlighting, RFC 6902 JSON Patch output, ignore noisy fields like timestamps and IDs. 100% private, no upload.
JSON Formatter & Validator
encoding
Format, validate and beautify JSON instantly in your browser. Free online tool with syntax validation, error detection, minify and one-click copy. 100% private.
JSON to YAML Converter
encoding
Paste JSON, get YAML instantly. Live conversion in your browser. K8s/Compose-ready, 2/4-space indent, smart quoting. 100% private, no upload.
JWT Decoder
security
Decode JWT tokens online with our free JWT decoder. Instantly inspect header, payload, signature, expiration, algorithm, and claims. 100% browser-based — your token never leaves your device. No signup, no tracking.
Length Unit Converter — Metric, Imperial & More
conversion
Convert between 16 length units instantly — metric, imperial, nautical & astronomical. 1 inch = 2.54 cm. Free, private, runs in your browser.
MD5 Hash Generator & File Checksum Tool
security
Generate MD5, SHA-256, SHA-1 & SHA-512 hashes online for free. Hash text or files in your browser, verify checksums and copy results. No signup needed.
Random Password Generator — Customizable, Strong & Secure
security
Generate strong random passwords instantly — free, 100% in your browser. Customize length & characters, batch up to 50 with entropy analysis.
Temperature Converter — Celsius, Fahrenheit, Kelvin, Rankine
conversion
Convert Celsius, Fahrenheit, Kelvin & Rankine instantly. Free online browser-based tool with conversion formulas, step-by-step guides and reference charts.
Unix Timestamp & Epoch Converter — Multi-Precision
datetime
Convert Unix timestamps to dates instantly. Auto-detects seconds, milliseconds & microseconds. Live clock, bidirectional. Free & private.
URL Encoder & Decoder with Built-in URL Parser
encoding
Decode or encode URLs in real time with built-in URL parser. Dual mode: encodeURI & encodeURIComponent. 100% private, no data sent to any server.
UUID Generator & Decoder — v1, v4, v5, v7 Batch Mode
security
Free UUID generator — create v1, v4, v5, v7 UUIDs instantly. Decode & validate any UUID. Batch generate up to 50. No signup, 100% browser-based.
Volume & Liquid Measurement Converter — 15 Units
conversion
Convert volume & liquid capacity between 15 units — metric, US customary, imperial & cooking. Free online converter, 100% private, runs in your browser.
Weight Converter — kg, lbs, oz, g, Stone & 13 Units Total
conversion
Convert weight between 13 units instantly — metric, imperial & troy. Conversion tables, formulas & references. Free, runs in your browser.
YAML to JSON Converter
encoding
Paste YAML, get JSON instantly. Live conversion in your browser. K8s manifests, OpenAPI specs, helm values supported. 100% private, no upload.