Image Converter
Convert your images between popular formats like JPG, PNG, and WEBP directly in your browser. There are no uploads to a server, no quality-loss surprises, and no watermarks — just fast, private conversion that finishes the moment you drop a file.
Processed in your browser. This tool runs entirely on your device. Your image is never uploaded to us.
Overview
Whether you need a transparent PNG for a logo, a lightweight WEBP for your website, or a universally compatible JPG for sharing, the Appzo image converter handles the round trip in a single click. Everything runs locally using your browser's native image engine, so even large files convert in seconds and your originals never leave your device.
What this tool does
The image converter re-encodes your photo or graphic from one format to another — JPG, PNG, or WEBP — using your browser's built-in canvas engine. You choose the target format and, for lossy formats, a quality level; the tool decodes the original, redraws it, and exports a brand-new file you can download instantly.
Problems it solves
- An app or website only accepts a format your image isn't in (for example, it rejects WEBP).
- A PNG screenshot is needlessly large and would be far smaller as JPG or WEBP.
- You need a transparent PNG but your source is a flattened JPG.
- You want to standardize a folder of mixed-format images into one consistent type.
Key benefits
- Convert to JPG, PNG, or WEBP in one click
- 100% client-side — your files never leave your device
- Preserve quality with adjustable output settings
- No watermarks, no sign-up, no file limits beyond 20 MB
Who it's for
How to use it
- 1
Upload your image
Drag and drop a JPG, PNG, or WEBP file into the upload area, or click to browse. Your file is loaded straight into the browser — nothing is sent to a server.
- 2
Choose the output format
Pick JPG, PNG, or WEBP as your target format. PNG keeps transparency and is lossless; JPG and WEBP are smaller and ideal for photos and the web.
- 3
Adjust quality (optional)
For JPG and WEBP, drag the quality slider to balance file size against visual clarity. PNG ignores quality because it is lossless.
- 4
Download the converted file
Preview the result with the before/after comparison, confirm the new file size, and click Download to save your converted image.
Example input and output
Example input
A 1600 × 1000 PNG screenshot of this site's compress page, straight from the screenshot tool — 245.4 KB.
Example output
The same image as WEBP at quality 85, unchanged in dimensions — 44.8 KB.
Converting from PNG to WEBP cut the file by 82% with no difference you can see at full size. These are measured figures, not estimates: the full benchmark and how to reproduce it are further down this page.
What the formats actually cost: measured
One image, every format and quality setting, encoded and measured on Aug 18, 2026. The subject is a 1600 × 1000 screenshot of this site's compress image page, captured in chrome — flat colour, hard-edged text, a limited palette. WEBP does unusually well on that kind of image, so treat these as screenshot figures rather than photograph figures.
| Format | Quality | Size | vs PNG |
|---|---|---|---|
| PNGThe original capture, lossless | Lossless | 245.4 KB | — |
| WEBPLossless mode — pixel-identical to the PNG | Lossless | 144.1 KB | 41% smaller |
| JPG | 95 | 179.0 KB | 27% smaller |
| JPGThe usual recommended setting | 85 | 161.5 KB | 34% smaller |
| JPG | 75 | 127.1 KB | 48% smaller |
| JPGText edges start to blur | 60 | 94.6 KB | 61% smaller |
| WEBP | 95 | 73.4 KB | 70% smaller |
| WEBPThe usual recommended setting | 85 | 44.8 KB | 82% smaller |
| WEBP | 75 | 31.6 KB | 87% smaller |
Resizing first changes more than quality does
The same screenshot resized to each width, then encoded at quality 85. Halving the width beats any quality setting you could have chosen.
| Width | PNG | JPG q85 | WEBP q85 |
|---|---|---|---|
| 1600px | 245.4 KB | 161.5 KB | 44.8 KB |
| 1200px | 271.8 KB | 99.5 KB | 26.0 KB |
| 800px | 137.2 KB | 50.2 KB | 14.2 KB |
Resizing the screenshot to 1200px made the PNG larger than the 1600px original (271.8 KB against 245.4 KB). Downscaling blends neighbouring pixels into new intermediate colours, and PNG's compression depends on long runs of repeated colour. The lossy formats show no such effect.
How to reproduce these numbers
Every figure is stat on a real encoder output. Nothing is estimated or carried over from a vendor claim.
- sips 316 — JPG encoding (macOS built-in)
- cwebp 1.6.0 — WEBP encoding (libwebp)
- Chrome 151.0.7922.138 — Screenshot capture
JPG via sips -s format jpeg -s formatOptions <q>, WEBP via cwebp -q <q>. Same source, same encoders, same numbers.
JPG vs PNG vs WEBP
Not sure which format to pick? Here is how the three formats this tool supports stack up.
| Feature | JPG | PNG | WEBP |
|---|---|---|---|
| Compression | Lossy | Lossless | Lossy or lossless |
| Transparency | No | Yes (alpha) | Yes (alpha) |
| Animation | No | No | Yes |
| Typical file size | Small | Large | Smallest — about 25–35% under JPG |
| Best for | Photographs | Logos, graphics, screenshots | Almost anything on the web |
| Browser support | Universal | Universal | All modern browsers |
Short version: reach for WEBP on the web, PNG when you need transparency or crisp graphics, and JPG when you want a photo that opens everywhere.
Common use cases
Make images web-ready
Convert heavy PNG or JPG assets to WEBP to shrink page weight and improve Core Web Vitals without sacrificing visible quality.
Fix compatibility issues
Turn WEBP downloads into JPG or PNG so they open in older apps, editors, and content management systems that don't support WEBP.
Create transparent graphics
Convert to PNG when you need an alpha channel for logos, icons, and overlays that must sit cleanly on any background.
Standardize a library
Normalize a mix of formats into a single consistent type before importing them into a catalog, deck, or design system.
Tips & best practices
Pick the format that matches the job
Use PNG for graphics, logos, and anything needing transparency; JPG for photographs you want small; and WEBP when you want the best balance of quality and size for the web.
Mind transparency when going to JPG
JPG can't store transparency, so transparent areas become white. If your image relies on a see-through background, convert to PNG or WEBP instead.
Convert, then compress for the web
For the smallest possible web image, convert to WEBP and run it through the compressor — you'll often shave another 20–40% with no visible difference.
Image Converter — frequently asked questions
Sources and further reading
The claims on this page about formats, browser behaviour, and performance come from these primary sources rather than from us.
- Image file type and format guideMDN Web Docs
Reference for what each image format supports, including transparency and animation.
- HTMLCanvasElement.toBlob()MDN Web Docs
The method that re-encodes a canvas to JPG, PNG, or WEBP, including the quality argument.
- WebP compression studyGoogle
Google's measured comparison of WEBP against JPEG across a large image corpus.
- Choose the right image formatweb.dev
Decision guidance for picking a format based on image content.
Related tools
Related reading
JPG vs PNG vs WEBP: Which Image Format Should You Use
A plain-English breakdown of when to use JPG, PNG, or WEBP — with file sizes measured from a real encode, and the mistakes that quietly bloat your site.
Read guidePrivacyWhy Your Images Never Leave Your Browser: How Client-Side Processing Works
Most image tools upload your file to a server. Here is what happens instead when everything runs in the browser — and how to verify it yourself.
Read guideLast reviewed and updated . Written and maintained by the Appzo Tools team.