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universal-image-converter

A universal image converter transcodes images between any pair of common formats — JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO, HEIC, SVG raster, and more — without forcing you to find a separate tool for each combination. The ZTools Universal Image Converter accepts drag-and-drop batches of mixed formats, runs entirely client-side on a WebAssembly pipeline, exposes per-format quality and compression knobs, and packages multi-file conversions as a single ZIP so you do not babysit ten downloads.

Use cases​

Web performance migration​

Modern sites prefer WebP or AVIF for 25–50% smaller files at the same quality. Convert a folder of legacy JPG/PNG hero images to WebP (or both) for serving via <picture> with fallback.

Cross-platform compatibility​

A designer ships TIFFs from a stock library; the CMS only accepts JPG. Convert in seconds, no Photoshop install required.

Print designers work in TIFF or BMP at 300 DPI; web teams need PNG/JPG at 72 DPI. Quick conversion plus optional downscaling unblocks the handoff.

Game and app assets​

Most engines prefer PNG for UI and texture sources. Convert a mixed pile of WebP/JPG/HEIC into PNG so the asset pipeline is uniform.

How it works​

  1. Drop your images — Mixed formats fine. JPG + PNG + WebP + HEIC + TIFF + BMP + GIF + AVIF all decode in the same session.
  2. Pick the target format — JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO, etc. The output format is global to the batch but per-format settings apply.
  3. Set format-specific options — Quality (lossy formats), compression level (PNG), animation (GIF/WebP), bit depth (TIFF), favicon sizes (ICO).
  4. Convert in browser — WebAssembly decoders + encoders run locally. No uploads. Multi-core via Web Workers when supported.
  5. Download — Single file → direct. Multiple → ZIP. Filenames preserved with the new extension.

Examples​

Input: 20 PNGs (1.2 MB each) → WebP quality 80

Output: ~400 KB each, indistinguishable visually

Input: TIFF 20 MB → JPG quality 90

Output: ~3 MB JPG, suitable for web

Input: GIF animated → WebP animated

Output: Smaller animated WebP, all frames preserved

Frequently asked questions​

Which format should I pick for the web?

AVIF if your audience is on modern browsers; otherwise WebP with a JPG fallback. Both beat plain JPG by 25–50% at the same visual quality.

Will conversion lose quality?

Lossless to lossless (PNG ↔ TIFF ↔ BMP) is exact. Anything to JPG/WebP/AVIF at < 100 quality is lossy. Keep originals if you might re-edit.

Does it handle animated formats?

Yes — GIF and animated WebP retain all frames during conversion. Animated AVIF support depends on browser.

Why is my converted PNG larger than the original JPG?

PNG is lossless; JPG is lossy. Going JPG → PNG gives you the JPG quality but the PNG file size. Stay in JPG (or pick WebP) for compression.

Is there a size limit?

Practical limit is your device memory. Most modern phones handle ~50 MB images; laptops push 500 MB+. Very large TIFFs may need to be processed one at a time.

Are colour profiles preserved?

sRGB is preserved end-to-end. Embedded ICC profiles are copied where the target format supports them (JPG, TIFF, PNG).

Tips​

  • For the web, prefer WebP or AVIF — same quality at half the size of JPG.
  • For archival, convert to PNG or TIFF — lossless, future-proof, no generational quality loss.
  • Always keep the originals. Converters are one-way for lossy formats.
  • Batch with the same target format and quality first — only override per file when needed.
  • For favicons, use the ICO output with sizes 16, 32, 48, 64 packed into one file.

Try it now​

The full universal-image-converter runs in your browser at https://ztools.zaions.com/universal-image-converter — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub