ToolNest
ToolNest is a free online toolbox: JSON formatter, JWT decoder, image compressor, QR generator, unit converters and more. No signup, no install, no paywall.
Popular tools
View all 33 tools →Base64 Encoder & Decoder
Encode or decode Base64 and URL-encoded text instantly. Supports UTF-8, large payloads, and one-click copy. Nothing leaves your browser.
Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more. All 14 conversions at once.
Color Converter
Convert colors between HEX, RGB, HSL, HSV and CMYK. Includes a live swatch and WCAG contrast ratio. Runs entirely in your browser.
CSS Gradient Generator
Create linear, radial and conic CSS gradients with a live preview. Copy the CSS instantly. Works entirely in your browser.
CSV to JSON Converter
Convert CSV to JSON with a live table preview. Handles quoted fields, embedded commas and newlines per RFC 4180. Runs in your browser.
Diff Checker
Compare two texts and see exactly which lines were added or removed. Side-by-side, colour-coded and instantly readable.
Epoch Converter
Convert between Unix timestamps, ISO 8601, RFC 2822, SQL datetimes, Excel serials and more. Covers every timestamp format you will meet.
Hash Generator
Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests plus CRC32 checksums of any text, right in your browser. No uploads, no server.
Latest guides
All articles →Free Design Tools Tools — 3 Online Utilities
Color, spacing and unit converters for designers and front-end developers. Every tool below runs entirely in your browser. Nothing you type or upload is…
Free Developer Tools Tools — 12 Online Utilities
Formatters, encoders, decoders and validators for everyday development work. Everything runs locally in your browser. Every tool below runs entirely in…
Free Image Tools Tools — 4 Online Utilities
Compress, resize and generate images without uploading anything to a server. Every tool below runs entirely in your browser. Nothing you type or upload is…