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CALCPARK

Image Converter

Convert images between JPG, PNG, WebP and BMP (AVIF where your browser supports it) and rasterise SVG at any width, all in the browser. Batch convert and download as ZIP.

Files stay on your device
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How to use it

  1. Drop the images. Mixed formats in one batch are fine.
  2. Choose the target format. For JPEG or WebP set the quality; for JPEG/BMP pick the background colour; for SVG set the output width.
  3. Press Convert, then download the file or the ZIP. The table shows the size change per file.

Example

A 1,200 × 800 px screenshot saved as PNG (1.4 MB) converted to WebP at quality 85 comes out around 90–120 KB with no visible loss; as JPEG at the same quality about 150 KB. A 120 × 80 unit logo.svg converted to PNG at 1,024 px becomes a 1,024 × 683 px bitmap with transparency preserved.

How the conversion works

Each file is decoded with createImageBitmap (EXIF orientation applied via imageOrientation: 'from-image'), drawn onto a canvas and re-encoded with canvas.toBlob(type, quality). Browsers that do not support a requested type silently return PNG instead, so the tool checks the returned MIME type and hides AVIF (and WebP on very old browsers) after a feature test on a 2 × 2 canvas. BMP has no browser encoder at all; the tool writes the 24-bit BITMAPINFOHEADER format itself (bottom-up rows, BGR, 4-byte row padding).

SVG is handled through an <img> element: the root element gets explicit width/heightattributes (keeping the viewBox) so the browser rasterises it at the requested resolution rather than its default 300 × 150 px. GIF decoding yields the first frame only. Re-encoding drops EXIF, XMP and colour-profile metadata, and colours are converted to sRGB.

Sources: MDN – HTMLCanvasElement.toBlob() (supported types), Microsoft – BITMAPINFOHEADER structure, SVG 2 – intrinsic sizing of the outermost svg element.

Which format should I choose?

  • WebP– smallest files for web use, keeps transparency, supported by every current browser.
  • JPEG– photos for email, documents and older software; no transparency.
  • PNG– lossless; screenshots, logos and anything with sharp edges or transparency.
  • BMP– uncompressed; only when a legacy program demands it (files are width × height × 3 bytes).

Questions

Why is AVIF missing from the list?
Canvas encoding to AVIF is not available in most browsers yet, and a browser that lacks it would silently hand back a PNG. The option appears automatically once your browser passes the feature test.
Can I convert HEIC photos from an iPhone?
Not with this tool: browsers other than Safari cannot decode HEIC on a canvas. Use the HEIC to JPG converter, which ships its own decoder, and then convert further if needed.
Does converting keep the photo metadata?
No. The canvas pipeline writes fresh pixels without EXIF, GPS or colour profiles. If you need to keep metadata, convert with a desktop tool such as ImageMagick or ExifTool.