CalcBrew

Image Converters

Resize Image

Set a width, a height or a percentage and get images at exactly the size a form, profile or print shop asks for. Batch-resize whole folders.

Runs in your browser — files never leave your device.

Drop image files here

or click to browse · paste from clipboard · up to 100 MB each

Select files
Options

Higher quality means a larger file. 80–90 is invisible in most photos.

Share:

About Resize Image

Passport photo sites, job portals and marketplaces specify exact pixel dimensions; a 4000 px camera photo is rejected or crushed. Resizing yourself keeps control over crop and sharpness.

Downscaling uses a high-quality Lanczos-style filter rather than the browser’s default, which avoids the jagged, aliased look of naive resizing. Upscaling is possible but cannot add detail — expect softness beyond 2×.

How it works

  1. Drop your files onto the box above, click it to browse, or paste from the clipboard.
  2. Adjust the options if you need to — the defaults suit most cases.
  3. Press Convert. The work happens on your device, so speed depends on your computer or phone.
  4. Download the result — individually or all at once.

About the formats

JPG · JPEG image · .jpg

The universal photo format: small files, supported by every device, camera and website, but no transparency and slight quality loss on each save.

  • JPEG compression discards fine detail the eye rarely notices; quality 80–90 is usually indistinguishable from the original at a fraction of the size.
  • Re-saving a JPG repeatedly adds generation loss, so keep an original and export copies.
  • JPG has no alpha channel — transparent areas become white or black when converted from PNG.

PNG · Portable Network Graphics · .png

Lossless image format with transparency, ideal for screenshots, logos, icons and graphics with sharp edges or text.

  • PNG is lossless: every pixel is preserved, which is why photos saved as PNG are 5–10× larger than JPG.
  • Supports an 8-bit alpha channel, so edges can be partially transparent.
  • Most browsers and apps have supported PNG since the late 1990s.

WebP · WebP image · .webp

Google’s web image format: 25–35 % smaller than JPG at the same quality, supports transparency and animation, but not every desktop app can open it.

  • WebP has both lossy and lossless modes, and both support transparency.
  • All modern browsers support WebP; older image editors, Windows Photos before 2020 and many print workflows do not.
  • Right-clicking and saving an image from a website often gives you a WebP file even if the page shows a JPG.

HEIC · High Efficiency Image Container · .heic

The default photo format on iPhone and iPad since iOS 11: about half the size of JPG at the same quality, but poorly supported outside Apple devices.

  • HEIC stores images with the HEVC (H.265) codec; a container can hold several images, such as a Live Photo or burst.
  • Windows needs a paid HEVC extension to open HEIC files, and many websites and forms refuse them.
  • iPhone can be set to shoot JPG instead: Settings → Camera → Formats → Most Compatible.

Related conversions

More in Image Converters · All converters

Frequently asked questions