Free Online Tools — Images, PDF, Calculators and Dev Tools
40+ free online tools: compress images to a target size, ID photos, PDF merge, mortgage calculator, JSON, Base64, word count and more. No sign-up; most tools run locally in your browser.
Popular tools
Compress Image to a Target Size
Shrink photos below 20KB, 50KB, 100KB or any size you need for exam or ID uploads. Batch support; runs locally in your browser.
Runs locallyID Photo Maker
Crop photos to passport, visa and 1-inch / 2-inch sizes, swap a plain background for white, blue or red, and export a single photo or a 4×6 print sheet.
Runs locallyMerge PDF Online for Free
Reorder and combine ordinary PDFs, preserving page sizes and selectable text without uploading.
Runs locallyMortgage Calculator
Calculate monthly payments and total interest, compare equal-payment and equal-principal schedules, and view the full amortization table.
Runs locallyFree QR Code Generator
Create static QR codes for URLs, text, Wi-Fi, contacts, email, phone and SMS. Apply a style preset, add text and download PNG or SVG.
Runs locallyJSON Formatter, Validator and Minifier
Validate JSON, format indentation or minify output while preserving large integers and precise numbers.
Runs locallyWord Counter
Count words, CJK characters, characters with and without spaces, paragraphs, lines and reading time as you type.
Runs locallyHEIC to JPG Converter
Batch convert iPhone HEIC / HEIF photos to JPG or PNG that open everywhere. Runs locally without uploading.
Runs locallyBrowse by category
Image tools
All 12 →Image Compressor
Reduce JPG, PNG and WebP file size. PNG uses lossless optimization; images are processed temporarily on the server.
Server processingImage Converter
Convert JPG, PNG, WebP, BMP, static GIF and single-page TIFF images.
Server processingResize Image
Resize JPG, PNG and WebP images to specific pixel dimensions, with optional aspect-ratio locking.
Server processingCrop Image Online
Crop images freely or use a fixed aspect ratio locally in your browser.
Runs locallyRotate Image Online
Rotate static images by any angle or use 90° shortcuts, entirely in your browser.
Runs locallyPhoto Metadata Viewer and EXIF / GPS Remover
Inspect JPG and PNG camera and location metadata, then re-encode locally to remove personal metadata.
Runs locallyImage to Text
Recognize Chinese and English in screenshots or scanned images, then copy text or download TXT locally.
Runs locallyCompress Image to a Target Size
Shrink photos below 20KB, 50KB, 100KB or any size you need for exam or ID uploads. Batch support; runs locally in your browser.
Runs locallyID Photo Maker
Crop photos to passport, visa and 1-inch / 2-inch sizes, swap a plain background for white, blue or red, and export a single photo or a 4×6 print sheet.
Runs locallyHEIC to JPG Converter
Batch convert iPhone HEIC / HEIF photos to JPG or PNG that open everywhere. Runs locally without uploading.
Runs locallyAdd Watermark to Images
Batch add text watermarks to ID copies or artwork with tiling, angle, opacity, color and position. Processed locally.
Runs locallyFavicon Generator
Create favicon.ico (16/32/48), an Apple touch icon and 192/512 PNGs from one image, with ready-to-copy HTML.
Runs locallyPDF tools
All 4 →Merge PDF Online for Free
Reorder and combine ordinary PDFs, preserving page sizes and selectable text without uploading.
Runs locallySplit PDF and Extract Pages Online
Extract selected PDF pages or save every page as a separate PDF in a ZIP archive.
Runs locallyOrganize PDF
Preview thumbnails, reorder or delete pages and rotate them before exporting a PDF locally.
Runs locallyImages to PDF
Arrange images and create a PDF with A4, Letter or image-sized pages.
Runs locallyText tools
All 6 →Text Diff
Compare two texts side by side or in a unified view, with line and character differences and Chinese support.
Runs locallyWord Counter
Count words, CJK characters, characters with and without spaces, paragraphs, lines and reading time as you type.
Runs locallyCase Converter
Convert text to UPPER, lower, Title or Sentence case and to camelCase, PascalCase, snake_case, kebab-case and more.
Runs locallyRemove Duplicate Lines and Sort Text
Remove duplicate and blank lines, trim spaces, sort alphabetically, numerically or by Chinese pinyin, reverse or shuffle lists.
Runs locallyChinese Converter
Convert between Simplified and Traditional Chinese, including Taiwan and Hong Kong variants and phrases, powered by OpenCC.
Runs locallyStrong Password Generator
Generate strong random passwords with custom length, letters, numbers and symbols, exclude look-alike characters, and see the strength.
Runs locallyData tools
All 2 →Developer tools
All 7 →Base64 Encode and Decode
Encode and decode Base64 with UTF-8 support, URL-safe output, and file or image to Data URI.
Runs locallyURL Encode and Decode
URL-encode or decode text and break query strings into a table to debug links and garbled characters.
Runs locallyUnix Timestamp Converter
Convert Unix timestamps to dates and back, auto-detect seconds vs milliseconds, and show local, UTC and ISO 8601 formats.
Runs locallyRegex Tester
Test JavaScript regular expressions live with highlighted matches, capture groups, flags and replacement preview.
Runs locallyHash and UUID Generator
Compute MD5, SHA-1, SHA-256 and SHA-512 for text or files to verify downloads, and generate UUID v4 in bulk.
Runs locallyJWT Decoder
Decode a JWT header and payload, pretty-print the claims, and convert exp, iat and nbf to readable dates with expiry status.
Runs locallyCron Expression Parser
Translate cron expressions into plain language and list the next 10 run times. Supports Linux, Spring, Quartz and AWS formats.
Runs locallyCalculators
All 6 →Mortgage Calculator
Calculate monthly payments and total interest, compare equal-payment and equal-principal schedules, and view the full amortization table.
Runs locallyLoan and Installment Calculator
Find the true annual rate from the amount, term and installment, or compute the installment from a rate, to reveal the real cost of “low fee” plans.
Runs locallyChina Individual Income Tax Calculator
Estimate China's monthly salary withholding tax and take-home pay under the cumulative method, with social insurance and special deductions, for all 12 months.
Runs locallyCompound Interest Calculator
Calculate the future value of a lump sum plus monthly contributions with compound interest, and chart growth year by year.
Runs locallyBMI Calculator
Calculate BMI from height and weight, see the WHO or Chinese category, and estimate BMR and daily calorie needs.
Runs locallyDate Calculator
Count days, weeks and months between dates, add or subtract days, and count weekdays excluding weekends.
Runs locallyMarkdown tools
All 3 →Online Markdown Editor
Write, preview and save Markdown, insert tables or export a PDF with selectable text.
Runs locallyMarkdown to PDF
Upload UTF-8 Markdown, choose A4 orientation, margins and page numbers, and export PDF.
Server processingMarkdown Table Generator
Paste spreadsheet cells or import CSV / TSV, edit values and generate a Markdown table.
Runs locally