Free Online Tools — No Sign-up, Runs in Your Browser

Paste JSON to beautify or minify it instantly; invalid JSON reports the exact error location.

Shrink JPG, PNG and WebP images with a quality slider — see before/after size and savings live.

Convert between Unix timestamps and date-time, with live current time in seconds and milliseconds.

Turn text or a URL into a QR code live — adjustable size, colors and error correction, PNG download.

Encode or decode text to Base64 in one click, UTF-8 safe, with clear errors on bad input.

Compute MD5, SHA-1 and SHA-256 digests of text instantly — multi-algorithm, one-click copy.

Paste text to count characters, words, lines and estimated reading time in real time.

Generate strong random passwords by length and character set, with look-alike exclusion and strength hints.

Paste text to count characters, words, lines and estimated reading time in real time.

Remove duplicate lines in one click, with case-insensitive matching and a removed-lines count.

Compare two texts line by side, with additions, deletions and changes highlighted and totaled.

Encode or decode text to Base64 in one click, UTF-8 safe, with clear errors on bad input.

Compute MD5, SHA-1 and SHA-256 digests of text instantly — multi-algorithm, one-click copy.

URL-encode or decode links and query parameters — spaces, non-ASCII and special characters made clear.

Generate UUID v4 in bulk — 1 to 100 at a time, uppercase option, copy all with one click.

Convert between Unix timestamps and date-time, with live current time in seconds and milliseconds.

Explain a cron expression in plain English and show its next five run times — verify schedules fast.

Shrink JPG, PNG and WebP images with a quality slider — see before/after size and savings live.

Resize, convert format, encode to Base64 and pick colors from one image — switch via tabs.

Turn text or a URL into a QR code live — adjustable size, colors and error correction, PNG download.

Generate strong random passwords by length and character set, with look-alike exclusion and strength hints.

Decode QR codes from an uploaded, dragged or pasted image — multiple codes per image supported.

Pick length, weight, temperature or data size, enter a value, and see every unit at once.

Convert colors between HEX, RGB and HSL with a live swatch and one-click CSS snippets.

Turn an amount into standard Chinese capital words (人民币大写), accurate to jiao and fen, ready for invoices.

Paste JSON to beautify or minify it instantly; invalid JSON reports the exact error location.

Test regular expressions with live match highlighting and capture groups, plus built-in examples.

Convert variable names between camelCase, snake_case, kebab-case and more — batch friendly.