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Resize PNG & JPEG online — PNG resizer & scale

Resize PNG online free—scale PNG with transparency, or resize JPEG/JPG by pixels or percent. Preview, then download PNG or JPG. No upload.

What is an image zoomer / zoom image tool?

An image zoomer (zoom image, zoom in image, zoom in picture, image zoom, zoom out image, zoom out picture) scales a photo or PNG by a percentage of its original size — greater than 100% to zoom in, less than 100% to zoom out — while keeping aspect ratio. The same page is a PNG resizer and JPEG resizer: set pixels or percent, lock proportions or stretch, preview, download. People searching “image zoomer” usually want this simple percent scale, not an AI magnifier. For AI upscaling see Bigjpg; for compression without changing pixels see Squoosh; for format conversion see JPG to PNG Converter and PNG to JPG Converter.

Image zoomer & resizer features

Zoom in/out by percent, or resize PNG/JPEG by exact pixels.

  • Percent zoom

    Zoom in image (>100%) or zoom out picture (<100%) with one slider.

  • Resize PNG with transparency

    Scale PNG uploads while preserving alpha—logos, icons, and UI stills.

  • JPEG / JPG resize

    Change size of JPEG photos with the same pixel or percent controls.

  • Exact pixel targets

    Set width/height when you need a specific canvas size, not just a zoom %.

  • Constrain proportions

    Lock aspect ratio—or unlock to stretch width and height independently.

  • Live preview & readout

    See original → output pixel sizes before you download PNG or JPG.

How to zoom an image online

Zoom in or out a picture — or resize by pixels — in a few steps.

  1. Upload your image

    Drop a PNG, JPG, or WebP—15 MB max.

  2. Choose percent to zoom

    Above 100% zooms in; below 100% zooms out. Or switch to pixels for exact sizes.

  3. Keep or unlock proportions

    Leave constrain on for clean logos; unlock only when you need a stretch.

  4. Check output dimensions

    Confirm the new width × height under the preview.

  5. Download PNG or JPG

    Export PNG to keep transparency; JPG for photos.

Tips for zooming and resizing

Cleaner zoom in / zoom out and scale results.
  • 01

    Percent for quick zooms

    200% = 2× zoom in; 50% = half-size zoom out.

  • 02

    Export PNG for logos

    Keep PNG download when you need transparency after a resize.

  • 03

    Prefer downscaling

    Zooming out usually looks sharper than heavy zoom-in upscaling.

  • 04

    Need AI enlargement?

    For smarter upscale beyond simple zoom, try Bigjpg.

  • 05

    Watch the max edge

    Output stops at 8192 px—lower percent if you hit the limit.

  • 06

    Changing shape, not size?

    Resizing scales both dimensions; it never changes the ratio. To reframe a photo to 1:1, 16:9, 9:16, or a custom ratio in one step, use Aspect Ratio Changer.

  • 07

    Album art sizing

    MP3 cover art stays sharp around 500–1000 px square. Once resized, embed it into the track with MP3 Cover Adder.

Image zoomer & resizers compared

How this free zoom image / resize PNG tool stacks up.

  • Online PNG Tools (zoom PNG)

    Competitor ranking for zoom in image, zoom image, and image zoomer. This page matches that intent with percent zoom in/out plus pixel resize — private in the browser.

  • Bigjpg (/curated/bigjpg)

    AI image enlarger for higher-quality upscales. Use this page for simple percent zoom and exact pixel targets.

  • iLoveIMG / Adobe Express

    Cloud resizers with batch options or accounts. This tool is a free browser-only image zoomer.

  • This image zoomer

    Zoom in/out by percent, resize PNG/JPEG by pixels, keep transparency, no signup.

Great for

When you need an image zoomer or PNG/JPEG dimension change.

  • Quick zoom in / zoom out

    Percent mode for 2× enlargements or half-size thumbnails.

  • Icons, logos & UI PNG

    Hit exact pixel sizes for app assets without killing transparency.

  • PNG image size reducer

    Downscale oversized PNG exports so pages and uploads stay light.

  • Email & form JPG uploads

    Reduce JPEG dimensions so attachments and applications accept the file.

Why use this image zoomer / resizer

Browser-based zoom and scale without accounts.

  • Zoom by percent

    Image zoom without calculating pixel math by hand.

  • PNG-first transparency

    Built for resizing PNG graphics that need a clean alpha channel.

  • JPG ready too

    Same tool works as a jpeg resizer when you upload photos.

  • Private & free

    No upload for processing, no watermark, unlimited downloads.

Technical details

How resize / zoom processing works here.
Canvas drawImage
Source bitmap scaled to target width and height with smoothing enabled.
PNG alpha
Transparency preserved through scale and PNG export.
Percent / zoom mode
Both dimensions multiplied by new value ÷ 100 — zoom in above 100%, zoom out below.
Constrained pixels
Secondary dimension derived from the upload’s aspect ratio.
Formats
PNG, JPEG/JPG, WebP, GIF stills in; PNG, JPG, or WebP out.
Input limits
15 MB upload; 8192 px max input and output edge.

Sources & References

References on PNG, JPEG, and browser canvas resizing.
  • “PNG supports lossless data compression and an optional alpha channel for transparency.”
    — Wikipedia — PNG

    PNG: PNG is the usual format for graphics that need sharp edges and transparency—exactly what a PNG resizer should preserve. en.wikipedia.org/wiki/PNG

  • “JPEG is a commonly used method of lossy compression for digital images.”
    — Wikipedia — JPEG

    JPEG: JPG photos use the same dimension controls when you need a jpeg change size workflow. en.wikipedia.org/wiki/JPEG

  • “Image scaling is the process of resizing a digital image.”
    — Wikipedia — Image scaling

    Image scaling: Upscaling and downscaling interpolate new pixel grids for both PNG and JPEG — the same math behind zoom in / zoom out. en.wikipedia.org/wiki/Image_scaling

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API: Resizing runs via Canvas 2D drawImage with smoothing, entirely client-side. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

Frequently Asked Questions

Quick answers about this tool—open a question to read more.