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Image Resizer

Resize images locally in your browser by pixel width or height with aspect-ratio modes: contain, cover crop, stretch, scale-down, plus ZIP download.

Drag & drop images here or click to select

Supports PNG / JPEG / WebP. AVIF / HEIC / HEIF input is accepted, but this resize path may output PNG.

File count

0 / 10

Total size

0 bytes / 150 MB

Single-file limit

25 MB

Image List (0)

Width

px

Height

px

Keep Ratio

Resize Mode
Image Resizer

Quick Start

1
Import images: add one or more PNG, JPEG, WebP, AVIF, HEIC, or HEIF files.
2
Set size: enter target pixel width, height, or both.
3
Choose mode: keep aspect ratio with contain, cover crop, or scale-down; use stretch only when distortion is acceptable.
4
Start resize: process the batch in your browser.
5
Download results: save single files or package successful items as ZIP.

Common Scenarios

Generate thumbnails

batch-create fixed-width or fixed-height previews for lists, dashboards, or file browsers.

Social media

standardize asset sizes for square, portrait, or landscape placements across platforms.

Banner assets

resize images to the dimensions required for headers, landing pages, or ad slots.

Avoid upscaling

use scale-down mode so smaller images keep their original size and stay sharper.

Resize Options

Width: Target width (pixels), leave empty to derive from height and mode
Height: Target height (pixels), leave empty to derive from width and mode
Keep ratio: preserves the source width/height relationship during resizing; Cover mode forces this on because it crops proportionally.
Contain: scale proportionally to fit within the target box; no crop, and actual output may be smaller than the target box.
Cover: requires both width and height; scale proportionally to cover the target box, then center crop to the target size.
Stretch: ignore ratio and resize directly; only use when distortion is acceptable.
Scale Down: shrink proportionally only when the original is larger than the target; never upscales smaller images.

Usage Advice

Cover mode requires both width and height, otherwise crop cannot execute
To avoid distortion, don't use stretch mode
To avoid upscaling, choose scale down mode
Large quantities or oversized images recommend batch processing, keep page in foreground

Limitations & Compatibility

Very large resolutions or too many files may cause memory issues or processing failures
Colors may have subtle differences after scaling (browser color management)
Processing may strip some metadata (e.g., EXIF)
PNG/JPEG/WebP input usually keeps its output format. AVIF/HEIC/HEIF may output PNG; there is no output format selector.
This is not an image compressor: no quality slider, target file size, or compression guarantee.
There are no social media presets, percent resize, longest side mode, manual crop, watermark, AI edit.

Privacy & Security

Image resizing runs in your browser. Selected images stay in page memory while this tool is open. Width, height, aspect-ratio, and mode settings may stay in browser storage; if WebDAV sync is enabled, those settings may sync according to your settings. Image files are not synced by default; they only enter WebDAV attachment sync when you explicitly enable attachment sync. Resized files are generated for individual downloads or ZIP and are not stored as separate results. The page does not send images for server-side resizing. On shared devices, clear images, results, saved settings, and site data when needed.

FAQ

6

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All tool processing happens locally in your browser.