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TinyPNG Alternatives: Compress Images Locally in 2026

TinyPNG uploads every image to their servers. Here are the best 2026 alternatives that compress PNG, JPG, and WebP entirely in your browser.

Zro7 Compress Image runs MozJPEG, OxiPNG, and WebP encoders as WASM in your browser. Images never touch a server.

The best TinyPNG alternatives in 2026 that don't upload your images: Zro7 Compress Image (browser-based, batch, multi-format), Squoosh by Google (single-file at a time), and ImageOptim (macOS desktop). All three use the same industry-standard encoders (MozJPEG, OxiPNG, cwebp) — just wired to your device instead of a remote server.

Why leave TinyPNG?

  • Free tier caps at 20 images / month, 5 MB each.
  • Every image is uploaded and — per their retention policy — kept for up to an hour.
  • For product photos, receipts, ID cards, or medical scans, uploading is a real risk.
  • You pay the network round-trip on every image; local compression is instant.

How the alternatives compare

  • Zro7 Compress Image — WASM MozJPEG / OxiPNG / cwebp; batch; unlimited; free.
  • Squoosh (Google) — Same codecs, excellent quality slider, but one file at a time.
  • ImageOptim (macOS) — Best-in-class local app; macOS only.
  • Caesium — Cross-platform desktop; solid but not browser-based.
  • TinyPNG — Upload-based; the 'do not use for private images' choice.

Do you actually lose quality?

MozJPEG at quality 82 is visually indistinguishable from TinyPNG's default. OxiPNG (lossless) matches or beats TinyPNG's PNG compressor on transparency-heavy images. For photos, prefer WebP or AVIF for another 20–40% saving.

Steps

  1. Open Compress Image.
  2. Drop a folder of images (JPG, PNG, WebP, AVIF).
  3. Pick target format and quality (or use Auto).
  4. Download the batch as a ZIP; original files stay put.

Frequently asked questions

Which codec is best for photos?

MozJPEG for compatibility, WebP for size, AVIF for the smallest at similar quality (slower encode).

Is PNG compression lossless?

Yes — OxiPNG rewrites the PNG smaller without changing pixels.

Batch limit?

None — Zro7 processes files in Web Workers, one per CPU core.

Does it strip EXIF?

By default yes for privacy; toggle 'Keep metadata' if you need copyright fields.

Any browser required?

Chrome/Edge/Firefox/Safari all work; Chromium-based browsers are fastest thanks to SIMD WASM.

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