Image Format Converter

Convert Images Between Formats Without Uploading Them

Drop one image or a hundred onto this converter, choose an output format, and download the results. The conversion happens entirely inside your browser using the Canvas API — your files are never uploaded to a server, never stored, and never seen by anyone but you. That matters more than it sounds: the images people most often need converted are phone photos, screenshots of internal systems, scanned documents and client artwork, none of which belong on a stranger’s server.

There is no account, no watermark, no per-file limit and no queue. Because the work is done locally, speed depends on your machine rather than on someone else’s upload bandwidth, which makes batch jobs noticeably quicker than they are on upload-based sites.

Formats It Reads and Writes

Not every format works in both directions, and the tool is explicit about which is which rather than failing silently.

So the practical output set is JPEG, PNG, WebP, GIF, BMP, ICO and PDF, and almost anything you are likely to have can be read as input.

How to Use It

1. Add your images. Drag them onto the drop zone or use the file picker. Multiple files at once is normal, not an edge case.
2. Pick the output format. Each option carries a one-line description of what it is good for, so you do not have to remember which one supports transparency.
3. Set quality if the format is lossy. The quality slider applies to JPEG and WebP output and defaults to 0.92 — visually indistinguishable from the original for most photos while cutting file size substantially.
4. Optionally resize. Enable resizing and set a maximum width and height; the default bounding box is 1920×1080. Aspect ratio is maintained by default, and images already smaller than the box are left alone rather than upscaled.
5. Convert. Progress is shown per file, and each file ends as complete or errored so a single bad file does not sink the batch.
6. Download. Grab files individually, or download everything that converted successfully in one action.

Choosing the Right Output Format

Photographs for the web: WebP first, JPEG as the safe default. WebP typically produces files 25–35% smaller than JPEG at equivalent perceived quality and is supported by every current browser. Use JPEG when the file will be consumed by older software, a printer workflow, or a system that rejects unfamiliar types.

Anything with transparency: PNG or WebP. Converting a transparent PNG to JPEG does not preserve transparency — JPEG has no alpha channel, so transparent areas become solid. If your logo comes out with an unexpected background, that is why.

Screenshots, diagrams and text: PNG. Lossy compression puts visible halos around hard edges and small type. PNG’s lossless compression is also more efficient than JPEG on flat-colour images, so you usually get a smaller file and a cleaner one.

iPhone photos for Windows or older software: HEIC to JPEG. HEIC stores the same image in roughly half the space, which is why Apple made it the default, but support outside the Apple ecosystem is still patchy.

Favicons and Windows icons: ICO, from a square source image.

Sending several images as one file: PDF output puts your images into a single document — convenient for receipts, ID scans, and anything a recipient wants to print.

Quality, Size and What Actually Changes

Two settings drive the output size, and they work differently. Quality controls how aggressively a lossy codec discards detail; it does not change pixel dimensions. Resize changes the pixel dimensions, and because file size scales roughly with pixel count, halving both width and height removes about three quarters of the data before compression is even considered. For web use, resizing is almost always the bigger win: a 4000-pixel-wide photo displayed in a 800-pixel column is carrying five times more detail than any visitor will ever see.

Two things worth knowing about lossy formats. First, quality loss compounds — each save of a JPEG re-encodes and degrades it again, so always convert from the original rather than from a previously converted copy. Second, converting a lossy file to a lossless one does not restore anything; a JPEG saved as PNG is a large file containing the same lost detail plus the compression artefacts baked in.

Because the conversion is performed by drawing the image onto a canvas, the output is pixel data only. Metadata carried by the original file — EXIF camera settings, GPS coordinates, embedded colour profiles — is not copied into the converted file. For most people this is a privacy benefit, since it means location data does not travel with a photo you are about to publish. If you specifically need EXIF preserved, this is not the right tool.

Related Tools

For single-purpose jobs there are focused versions of the same engine: HEIC to JPG for iPhone photos, WebP to GIF for animated WebP, and image to PDF optimised for phone use. If your goal is a smaller file rather than a different format, use the image compressor instead.

Frequently Asked Questions

Are my images uploaded anywhere?

No. Conversion runs in your browser. Files are read locally, drawn to a canvas and re-encoded on your machine. Nothing is transmitted, stored or logged, which is why the tool works the same whether your connection is fast or terrible.

Can I convert several images at once?

Yes. Add as many as you like, convert them in one pass with shared settings, and download the completed set together. Files that fail are reported individually so the rest still finish.

Why can’t I export to HEIC, AVIF, TIFF or SVG?

Browsers can decode those formats but do not provide an encoder for them through the canvas API, so they are input-only here. SVG in particular is a vector format — converting a raster image to SVG is a tracing operation, not a format conversion, and the result would not be what you expect.

My PNG lost its transparency when I converted it. Why?

You converted to JPEG, which has no alpha channel. Choose PNG or WebP output to keep transparency.

What quality setting should I use?

The 0.92 default is a good general choice for photographs. Drop toward 0.8 when file size matters more than fine detail; going much below that starts to show visible artefacts around edges and in flat gradients.

Does resizing make images blurry?

Scaling down is safe and generally looks fine. Scaling up cannot invent detail that is not present, so it always softens the image — the resize option only bounds the maximum size and will not enlarge an image that is already smaller.

Is EXIF data such as GPS location kept?

No. The canvas-based conversion writes pixel data only, so camera metadata and location coordinates do not carry across. That is usually what you want before publishing a photo.

Is there a file size or file count limit?

There is no artificial limit. The practical ceiling is your device’s memory, since every image has to be decoded into it. Very large batches of very large photos are best done in a few passes.