$ cat README.md
Free Online Developer Tools. Zero data leaves your machine.
JSON formatter, image resizer, Base64 encoder, UUID generator, and 30+ free browser-based tools. Convert, decode, and transform files entirely client-side. No server, no upload — 100% client-side.
all processing runs in your browser
$ ls ./tools
Image Tools
typenamedescription
imaheic-to-jpgConvert Apple HEIC photos to JPG
imabase64-to-imageConvert Base64 to images
imaimage-to-base64Convert images to Base64
imaimage-resizerResize images to exact dimensions
imawebp-converterConvert images to WebP
imapng-to-jpgConvert PNG to JPG
imaimage-compressorCompress images
imabackground-removerRemove image backgrounds
Developer Tools
typenamedescription
devjwt-decoderDecode and inspect JSON Web Tokens
devyaml-to-jsonConvert YAML to JSON format
devcsv-viewerView CSV files as tables
devhtml-minifierMinify HTML code
devcsv-to-jsonConvert CSV to JSON
devjson-to-csvConvert JSON arrays to CSV
devxml-to-jsonConvert XML to JSON
devexcel-to-csvConvert Excel to CSV
devbase64-encoderEncode/decode Base64
devurl-encoderEncode/decode URL strings
devjson-to-yamlConvert JSON to YAML format
devtimestamp-converterConvert Unix timestamps to dates
devhash-generatorGenerate SHA hashes
devregex-testerTest regex patterns
devjson-formatterFormat and validate JSON
devjsonl-validatorValidate JSONL line by line
devquery-params-to-jsonConvert query strings to JSON
devhex-to-rgbConvert HEX to RGB colors
devnumber-base-changerConvert between number bases
devcss-units-converterConvert px/rem/em/pt
devsql-minifierMinify SQL queries
devwcag-contrast-checkerCheck WCAG contrast compliance
devcss-inlinerInline CSS for emails
devenv-to-netlifyConvert .env to Netlify TOML
devhar-viewerView HAR network logs
devsvg-viewerPreview SVG code
devspeed-testTest download/upload speed
devcolor-pickerPick and convert colors
devroman-numeral-converterConvert numbers ↔ Roman numerals
devbinary-text-converterConvert binary ↔ text
devcredit-card-validatorValidate card numbers (Luhn)
devhex-string-converterConvert hex ↔ text strings
devcron-expression-generatorBuild and validate cron expressions
devascii-text-converterConvert ASCII codes ↔ text
devhmac-generatorGenerate HMAC authentication codes
PDF Tools
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pdfpdf-mergerMerge PDF files
pdfpdf-splitterSplit PDF into pages
pdfrotate-pdfRotate PDF pages
pdfpdf-to-imagesConvert PDF pages to images
pdfimages-to-pdfConvert images to PDF
pdfpdf-watermarkAdd text watermark to PDF
pdfencrypt-pdfPassword-protect PDF files
pdfdecrypt-pdfRemove PDF password protection
Text Tools
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texmarkdown-to-htmlConvert Markdown to HTML
texhtml-to-markdownConvert HTML to Markdown
texword-counterCount words and characters
texcharacter-counterCount characters and letter frequency
texsentence-counterCount sentences and analyze readability
textext-case-converterConvert text between cases
texremove-whitespaceRemove extra spaces and blank lines
texbackwards-textReverse and flip text
texnumbers-to-wordsConvert numbers to English words
texunicode-text-generatorGenerate fancy Unicode text styles
texmorse-code-translatorTranslate text ↔ Morse code
texglitch-text-generatorGenerate glitchy Zalgo text