Tinker Tools

Image Format Converter Instantly

Convert images between JPG, PNG, and WebP formats. All processing is done locally in your browser—your images never leave your device.

Preview

Drop your image here or click to browse

Supports JPG, PNG, WebP, GIF, BMP

How it works

1. Upload Image

Drag and drop or click to upload any image. We support JPG, PNG, WebP, GIF, and BMP formats. Your file stays in your browser.

100% Private

2. Choose Format

Select your desired output format (JPG, PNG, or WebP) and adjust the quality slider for lossy formats to balance file size and visual quality.

Quality Control

3. Download Result

Compare the original and converted images side by side with file size stats. Download the converted image with one click.

Size Comparison

What Does This Image Converter Do?

This converter takes one image and re-saves it as JPG, PNG, or WebP. The picture itself does not change — same subject, same width, same height — only the way the pixel data is encoded on disk. Because each format uses a different compression scheme, the same photograph can weigh several megabytes as a PNG and a few hundred kilobytes as a WebP, which is why format choice is one of the easiest wins in any image workflow.

You can load JPG, PNG, WebP, GIF, BMP, or anything else your browser knows how to decode. Output is limited to the three formats the browser can reliably encode from a canvas: JPG, PNG, and WebP. Quality is adjustable for JPG and WebP through a slider that defaults to 90; PNG is lossless and ignores the slider entirely, which the interface points out when you select it.

The conversion runs on the Canvas API inside your browser. The image is drawn onto an off-screen canvas at its original dimensions and `toBlob()` re-encodes it in the target format. One consequence worth knowing up front: a canvas holds a single still frame, so an animated GIF or animated WebP loses its animation and converts to one static image. Nothing is uploaded to a server at any point in the process.

Key Features and Benefits

  • JPG, PNG, and WebP output — Convert to the three formats that every current browser can both encode and display. WebP is the modern default for the web, JPG is the compatibility choice for older software and email, and PNG is the option when you need lossless output or a real alpha channel.
  • Wide input support — Load JPG, PNG, WebP, GIF, or BMP. The tool reads whatever your browser can decode and reports the detected source format next to the preview, so you can confirm you loaded the file you meant to. Formats the browser cannot decode, such as HEIC, produce a clear error message instead of a blank result.
  • Quality control for lossy targets — When the target is JPG or WebP, a slider sets the encoder quality from 1 to 100, defaulting to 90. Lower it when you want a smaller file and can accept some softening; raise it when the image contains text or fine detail. The slider is disabled for PNG because the format has no quality parameter.
  • Automatic white fill for JPG — JPG has no alpha channel, so transparent regions have to become something. Converting to JPG fills the canvas with white before drawing the image, which gives a predictable result instead of the black or garbage backgrounds some converters produce. If you need the transparency kept, convert to PNG or WebP instead.
  • Format and size comparison — After converting you see the source format and size beside the output format and size, plus the percentage change. Conversions that make the file bigger are shown as a positive percentage, which is common when moving from a lossy source to PNG.
  • Dimensions preserved exactly — Conversion is purely a re-encode. Width and height come out identical to the input, so converted assets drop straight back into the same layout slot without any repositioning.

How to Convert an Image Format

  1. 1

    Load one image

    Drag a file onto the upload area or click to browse. The tool works on a single image at a time and displays its dimensions and detected format once loaded, so you can confirm the starting point before converting.

  2. 2

    Choose the target format

    Pick JPG, PNG, or WebP. If your source has transparency and you choose JPG, expect the transparent areas to come out white — switch to PNG or WebP if that matters. If your source is an animated GIF, note that only a single still frame will be converted.

  3. 3

    Set the quality for lossy targets

    For JPG and WebP, drag the quality slider to the level you want. Around 90 keeps the result visually indistinguishable from the source for most photographs; dropping to 75-80 saves meaningful space on large images. Selecting PNG disables the slider since PNG output is always lossless.

  4. 4

    Convert and compare

    Click Convert Image. The converted version appears below the original with its new format and file size, along with the size change as a percentage. Look closely at text edges and smooth gradients — those are the first places lossy encoding shows. Adjust the quality and convert again if needed.

  5. 5

    Download the result

    Click Download to save the converted file with the extension matching your chosen format. The source file on your machine is untouched, so you can convert the same image to several formats and compare the results before deciding which to ship.

Expert Tips for Choosing an Image Format

Use WebP as your default for anything going on the web. WebP supports both lossy and lossless modes plus full alpha transparency, and at comparable perceived quality it consistently produces smaller files than JPG. Browser support is effectively universal on anything current. Keep JPG in reserve for places where compatibility still bites — some email clients, older desktop software, and a handful of upload forms that reject anything but JPG and PNG.

Choose PNG for graphics, not for photographs. PNG's compression works by predicting each pixel from its neighbors, which is extremely effective on flat colors, sharp edges, and large uniform regions — logos, icons, screenshots, diagrams. Run a photograph through it and you get a file several times larger than the JPG or WebP equivalent with no visible benefit. The size comparison shown after each conversion makes this trade-off obvious in a few seconds of experimenting.

Handle animation and transparency deliberately. Because this tool renders through a canvas, an animated GIF or WebP converts to a single still frame — useful when you actually want a poster image, a problem if you expected the animation to survive. Transparency has a similar catch: converting to JPG replaces transparent pixels with white, which looks fine on a white page and obviously wrong anywhere else. When either matters, convert to PNG or WebP and verify the result in the preview before downloading.

Related Tools

Image Compressor

Dial in the quality setting against a live size readout when shrinking the file matters more than switching format

Image Resizer

Change width and height first — this converter always preserves the original dimensions

GIF Maker

Build an animated GIF from a set of still images, since converting an animation here keeps only one frame

Format conversion is the cheapest optimization available: the same picture, stored more efficiently, with no visual compromise when you pick the right target. Pair it with resizing to eliminate pixels that were never going to be displayed, and with compression to tune the quality-versus-size balance on the format you settled on. All three tools run entirely inside your browser, so a complete optimization pass happens without a single file leaving your device.

Frequently Asked Questions

Recommended Tools

Image Resizer

Resize images instantly in your browser. Adjust width, height, and format with aspect ratio lock.

Image Compressor

Compress images with adjustable quality. Reduce file size while preserving visual quality.

Color Converter

Convert colors between HEX, RGB, HSL, and HSB formats with a live color preview.