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.

Convert between Simplified and Traditional Chinese live, powered by the OpenCC standard lexicon.

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.

Find the difference between two dates in days/weeks/months, or add and subtract days from a date.

Convert one time across major time zones — New York, London, Tokyo, Sydney and more, live.

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.

Drop a photo to inspect its EXIF metadata: camera, date, GPS location, exposure and more.

Convert images between PNG, JPG and WebP with adjustable quality — all done locally in your browser.

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.

Generate standard barcodes (CODE128, EAN-13 and more) with adjustable style and PNG download.

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.

Enter loan amount, term and rate to compare equal-payment vs equal-principal plans with full amortization details.

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.

Convert CSV to a JSON object array or export a JSON array as standard CSV — live both ways.

Combine multiple images into one PDF with adjustable order and page size — all in your browser.

Combine multiple PDFs into one file in your chosen order — all locally in your browser.

Extract a page range from a PDF or split it into single-page files — all locally in your browser.

Convert Excel (xlsx/xls/csv) to JSON or CSV, and paste JSON/CSV data to generate an Excel file — parsed locally.