Image Converter

What is an image converter?

An image converter changes a picture from one file format to another — for example turning a PNG screenshot into a smaller WebP, or an iPhone-style image into a universally compatible JPG (for actual .heic files straight off an iPhone, use the dedicated HEIC to JPG converter). The visible picture stays the same; what changes is the container and the compression scheme used to store the pixels, which affects file size, transparency support and where the image will open.

This tool runs entirely in your browser. When you drop a file, it is drawn onto an off-screen HTML canvas and re-encoded in the format you choose. Because all of that happens on your own machine, there is no upload, no waiting in a queue, and no limit on how many files you can run through it. Your images stay private.

How to use it

1. Pick an output format. Choose PNG, JPG, WebP or AVIF before or after you add files. The choice applies to every image in the batch.
2. Set the quality. For the lossy formats (JPG, WebP, AVIF) a slider controls the trade-off between file size and detail. PNG is lossless, so the slider is disabled for it.
3. Add your images. Click the drop zone or drag in one file or fifty. PNG, JPG, WebP, AVIF, GIF and BMP sources all work.
4. Review the results. Each converted file shows a thumbnail, its dimensions, and the original-to-new size change.
5. Download. Save each file individually, or hit Download all to grab the whole batch in one go — no ZIP to unpack.

Change the format or quality and re-drop the files to convert them again with the new settings; the originals on your disk are never touched.

PNG, JPG, WebP and AVIF — when to use each

Choosing the right format is usually more important than fiddling with the quality slider.

• PNG is lossless and supports transparency. It is the right choice for logos, icons, screenshots of text, line art and anything with sharp edges or flat colour. The downside is size: photographs saved as PNG are often huge.
• JPG (JPEG) is the most widely supported format on the planet — every browser, email client, operating system and printer understands it. It is lossy and has no transparency. Reach for JPG when you need maximum compatibility for a photograph and don't need a transparent background.
• WebP is a modern format that typically saves 25–35% over JPG at the same perceived quality, and unlike JPG it supports transparency and animation. Every current browser supports it. It is an excellent default for the web.
• AVIF is newer still and usually the smallest of the four at a given quality, with excellent handling of gradients and skies. Support for displaying AVIF is now broad, but support for encoding it from a browser canvas is limited to Chromium-based browsers — which is why this tool may disable AVIF in Safari or Firefox.

A simple rule of thumb: flat graphics and transparency → PNG, maximum compatibility → JPG, smallest modern web image → WebP or AVIF.

Why convert at all?

There are a handful of everyday reasons people convert images:

• Smaller files for the web. Converting bulky PNG photos to WebP or AVIF can cut page weight dramatically, which speeds up loading and helps SEO.
• Compatibility. A platform, CMS or old piece of software might only accept JPG or PNG. Converting saves you the rejection.
• Transparency. Moving from a flat JPG to PNG or WebP lets you keep a transparent background — useful for logos that sit on coloured layouts.
• Consistency. When you have a folder of mixed formats, batch-converting everything to one format keeps a project tidy and predictable.

Batch conversion without limits

Most online converters route your files through their servers, which is why they cap free use — three files at a time with TinyPNG, or a premium upsell with iLoveIMG to unlock bulk mode. Those limits exist because they pay for the bandwidth and compute.

Here, the browser does the work, so the economics are different: there is no file-count cap, no premium tier and no account. Drop in a whole folder, pick your format, and download the lot. The only real limit is your device's memory, and for ordinary photos that is thousands of images before it matters.

Tips and best practices

• Convert once, at the end. Each lossy save throws away a little detail. Keep an original or a lossless master and export a converted copy only when you're finished editing.
• Use the right quality for the job. Around 80% is a good default for WebP and JPG. Drop lower for thumbnails; nudge higher for hero images that will be viewed large.
• Mind transparency before flattening. Converting a transparent PNG to JPG fills the see-through areas with white. If that matters, choose PNG, WebP or AVIF.
• Prefer WebP when AVIF isn't available. If the AVIF option is disabled in your browser, WebP gives you most of the size benefit and works everywhere.
• Resize first if the image is oversized. A 4000-pixel-wide photo destined for a small slot on a page will shrink far more if you resize it with the Image Resizer before converting.

Private by design

Because decoding, re-encoding and previewing all happen inside your browser tab, you can convert sensitive material — receipts, ID photos, contracts, unreleased designs — without any of it being uploaded, logged or retained. Convert, download, and the data is gone the moment you close the tab. That is the core difference between Pageonaut's local-first tools and the upload-based converters that ask you to trust a server with your files.