What is MiniPx?
MiniPx is a free image compressor, converter and resizer that runs entirely inside your web browser. It is built and maintained by Gaurav Bhowmick and lives at minipx.com. Unlike TinyPNG, iLoveIMG, Compressor.io or Cloudinary, it has no upload step and no server-side processing: images are decoded, re-encoded and written back to disk by JavaScript, WebAssembly codecs and the Canvas API running on your own device. There is no account, no daily or monthly quota, and nothing to delete afterwards, because nothing was ever sent anywhere.
Everything on this page is free. MiniPx Pro costs $3.24 a month or $59 once, and it lifts the free tier's five-files-per-batch cap, adds responsive image sets, multi-format export, watermarking, saved presets and 6 batch rename templates, and raises the AI background remover from 1080px watermarked output to 4096px without a watermark. Per-file input is capped at 200 MB; beyond that the constraint is your device's memory rather than our infrastructure, since there is none.
Compression
MiniPx compresses JPEG, PNG, WebP, AVIF and GIF images (an animated GIF is flattened to its first frame). PDFs are not compressed directly: the PDF tool renders pages to images and rebuilds a PDF from images, which shrinks scans at the cost of selectable text. Compression runs client-side using WebAssembly codecs, the Canvas API and Web Workers — your images never leave your browser tab. Three preset levels (Gentle, Smart, Tiny) cover every use case from portfolio-quality to minimum file size. Auto Quality analyses each image individually and picks the optimal setting.
Target-size compression lets you hit exact file size limits: 10KB through 1MB. This handles government form uploads (50KB for Indian exam portals), social media limits, and email attachment constraints without trial and error.
Format conversion
Convert between 9 image formats: JPEG, PNG, WebP, AVIF, BMP, TIFF, SVG, GIF, and HEIC. Common conversions include PNG to JPG (reduce file size), HEIC to JPG (iPhone compatibility), WebP to PNG (editing compatibility), and JPG to AVIF (next-gen compression).
Every conversion strips EXIF metadata automatically. SVG to raster conversion (PNG or JPG) renders vectors at full resolution. HEIC decoding uses the libheif WebAssembly decoder so iPhone photos work on any browser without installing additional software.
Resize, crop, and rotate
Resize images by pixel dimensions or target file size. Crop to specific aspect ratios. Rotate to fix orientation. Dedicated presets for passport photos (various country specifications), social media platforms (Instagram, Facebook, LinkedIn, YouTube, Twitter), and common web dimensions.
The resize-in-KB tool combines dimension scaling with compression to hit a specific file size target — useful when a platform requires both dimension and size constraints simultaneously.
Platform-specific optimization
Pre-configured compression settings for 12 platform targets: Instagram (post, story, reel cover), LinkedIn (post, profile picture), X (post, header), Facebook, YouTube thumbnails, WhatsApp status, email attachments, and resume photos. Each preset applies the correct dimensions, format, and file size for that platform.
Bulk processing
Drop multiple files at once. Each image processes independently in parallel using Web Workers. Download results individually or as a single ZIP archive. Free tier processes 5 files per batch; Pro removes the cap entirely.
Pro tier ($3.24/mo, $29/yr, $59 lifetime)
Pro keeps the same browser-based privacy and adds production-grade controls for people who ship images every day. One input becomes a complete responsive set (150 / 640 / 1280 / 2560 px), exported across AVIF, WebP, JPG, and PNG simultaneously — up to 16 outputs per input via Cartesian product.
Watermarking applies to both the primary output and every responsive variant, with 9 anchor positions, opacity and scale controls — see the bulk watermark workflow. Twelve platform presets cover Instagram, LinkedIn, X, Facebook, YouTube, WhatsApp, and Resume Photo specs in one click. Saved presets bundle your favourite combination of size, format, watermark, codec and rename template for one-click application later.
Advanced codec controls expose JPEG chroma subsampling and per-format quality overrides, which apply to every output in that format, primary included — leave one blank and that format follows the main quality setting. Batch rename offers 6 fixed naming templates — sequence, date, width, format, or keep the original name — so output filenames stay tidy across batches. A free preview lets you try the full Pro stack on one compression per browser, no signup required. Persona pages: for SEO + Core Web Vitals, for ecommerce, for developers.
Pro AI tools unlock 4K background removal (vs 1080p free) and passport photos from a higher-resolution source pipeline, with a manual crop and a 4×6 inch print sheet. The delivered passport photo is sized to the country’s official spec on either tier. Use cases include LinkedIn headshots, product photos, logos, and full background replacement. License activation is server-validated through Paddle, then HMAC-signed so a forged localStorage entry cannot unlock Pro features. Activations are capped per plan (5 for monthly/annual, 10 for lifetime) with self-service device management at /account/.
PDF tools
Create PDFs from images (single or multi-page) using jsPDF. Extract PDF pages as images using pdfjs-dist. Compress existing PDFs by re-rendering pages at lower quality. All PDF processing runs locally — no upload to external services.
Privacy and security
Every operation runs in JavaScript inside your browser tab. Files never enter a network request. Works offline after initial page load. EXIF metadata (GPS, camera info, timestamps) is stripped automatically. GDPR and UK Data Protection Act compliant by architecture, not by policy. Safe for passport photos, medical images, legal documents, and unreleased business materials.
Supported formats
| Format | Compress | Convert from | Convert to |
|---|---|---|---|
| JPEG | ✓ | ✓ | ✓ |
| PNG | ✓ | ✓ | ✓ |
| WebP | ✓ | ✓ | ✓ |
| AVIF | ✓ | ✓ | ✓ |
| GIF | ✓ | ✓ | ✓ |
| HEIC | — | ✓ | — |
| BMP | — | ✓ | — |
| TIFF | — | ✓ | — |
| SVG | — | ✓ | — |
Technical details
MiniPx uses the browser's native Canvas API for JPEG and PNG encoding. WebP and AVIF go through WebAssembly encoders we ship, because Safari's Canvas API silently substitutes PNG when asked for WebP, and Chrome, Firefox, and Edge cannot write AVIF at all — only Safari 16+ encodes AVIF natively. HEIC decoding uses the libheif WebAssembly decoder. PDF creation uses jsPDF. PDF page extraction uses pdfjs-dist. Bulk processing uses Web Workers for parallel execution. No external image processing APIs are called.
The entire application is a static site built with Next.js 16, exported as HTML/CSS/JS, and hosted on Netlify. There is no backend server, no database, no user accounts, and no file storage. The compression logic is the same whether you are online or offline.