Is there a file or batch size limit?

There is no hard server-side limit because nothing is uploaded — everything runs in your browser. Practical limits depend on RAM: most laptops handle 200–500 photos at 4–12 MP without issue. For very large folders, resize in chunks of 100.

Will the tool stretch my images?

Only if you turn off 'Maintain aspect ratio'. With aspect ratio locked (default), the longer dimension is fit inside the target box and the other is calculated automatically — no distortion.

What format should I pick?

WebP if your destination supports it (every modern browser, every modern CMS) — it cuts JPEG size by 25–35% at the same visible quality. JPEG for maximum compatibility with older tools. PNG only when you need transparency or perfectly lossless output.

Does this re-compress my photos?

Yes. Resizing requires re-encoding, which is lossy for JPEG and WebP. Pick a quality of 90% or higher to keep visual loss imperceptible; below 70% you'll see compression artefacts on smooth gradients and skin tones.

Are EXIF and metadata preserved?

No. The browser Canvas pipeline used by this tool strips EXIF when re-encoding. If you need to keep camera metadata (date, GPS, lens), use a desktop tool such as ExifTool after resizing, or run our metadata-editor first to copy tags.

How is privacy handled?

Every operation runs in your browser using the Canvas API. No image bytes leave the device — safe for client photos, internal documents and unreleased product shots.

Can I download files individually?

Single uploads download directly. For batches, the tool packages everything into a ZIP because most browsers throttle or block more than one download at a time.

Why does the output look softer than I expected?

Big downscales (4000 → 800 px) lose detail by definition. The tool uses the browser's high-quality bicubic resampler, which is good but not as sharp as Photoshop's bicubic-sharper. Apply a 1-pixel unsharp mask after resizing for print-quality results.

Free Batch Image Resizer — Resize Multiple Photos at Once Online

Resizing one image is easy. Resizing two hundred — for a product catalogue, a real-estate listing, a wedding gallery, or a CMS migration — is where most browser tools fall over. PikDraw's Batch Image Resizer handles the whole folder in a single pass, locally in your browser, with a live progress bar and a one-click ZIP at the end. No upload, no signup, no premium tier.

What is the Batch Image Resizer — Bulk Resize Photos Online?

Batch Resize is a browser-based bulk image resizer that accepts unlimited JPG, PNG and WebP files, applies the same target width and height to every image, optionally preserves aspect ratio, re-encodes to your chosen format and quality, and downloads the result as a ZIP. The entire pipeline runs on the device using HTML5 Canvas and JSZip — your photos never leave the browser.

Key features

Unlimited files per batch (bounded only by browser RAM)
Exact width and height in pixels, up to 10000 × 10000
Aspect-ratio locked or free-stretch mode
Output to JPEG, WebP or PNG
Quality slider for JPEG / WebP
Live progress, automatic ZIP packaging
100% client-side — no upload
Free and unlimited, no watermark

How it works

Each upload is decoded with the browser's native image decoder and drawn onto an off-screen Canvas at the target dimensions. The Canvas uses high-quality bicubic resampling. The pixels are then re-encoded with canvas.toBlob() at the selected format and quality. Results are streamed into a JSZip archive that is generated and downloaded in a single operation. Because everything happens in the browser, there are no upload limits or queue waits.

Why use this tool

Desktop bulk resizers (XnConvert, IrfanView) work but require installation and are platform-locked. Online batch resizers usually cap free use at 10–20 files and force a signup beyond that. PikDraw's Batch Resize has no cap, no signup, and no privacy concern because nothing is uploaded. It is the fastest path from a folder of raw shots to a folder of CMS-ready images.

Common use cases

Resize a product photography shoot to a single web-ready width
Bulk-prepare images for a Shopify, WooCommerce or BigCommerce catalogue
Shrink real-estate or travel galleries before uploading to a CMS
Generate uniform thumbnails for a portfolio site
Resize wedding or event photos before sharing via cloud storage
Prepare images for email — many providers cap at 25 MB total
Standardise screenshots for documentation or a knowledge base

How to use this tool

Upload multiple images — Drop a folder of JPGs, PNGs or WebPs into the upload area — or paste from clipboard. There is no fixed limit, but very large batches (hundreds of 20 MP photos) are bounded by available browser memory.
Set target dimensions — Type the exact target width and height in pixels. Leave one field blank if you want the other dimension to be calculated from the aspect ratio. Up to 10000 px on either side.
Choose aspect-ratio behaviour — With 'Maintain aspect ratio' on, the tool fits each image inside the box without stretching. Turn it off only if you specifically want to force every photo into the same rectangle (warps content).
Pick an output format — JPEG for photos (smallest, lossy), WebP for the modern web (best ratio of quality to size), PNG when you need lossless or transparency. Quality slider applies to JPEG and WebP only.
Run the batch — Hit Resize — every image is processed locally in your browser, in sequence, with a live progress bar. A single image downloads directly; multiple images are bundled into a ZIP.

Who should use this

E-commerce store owners preparing product catalogues. Photographers delivering web galleries. Real-estate agents publishing listings. Marketers preparing campaign assets. Bloggers migrating posts between platforms. Anyone who needs the same dimensions applied to dozens or hundreds of images without paying for a subscription.

How to get started

Drop your folder into the upload area, type a target width (e.g. 1600), keep 'Maintain aspect ratio' on, pick WebP at 85% quality, and click Resize. A few seconds later you'll have a ZIP ready to upload.

Best practices

Always keep originals — resizing is destructive
Use WebP unless a destination explicitly requires JPEG
Resize to the largest size you actually need, not bigger
Quality 85–90% is the sweet spot for web
For print, never resize down — print needs the full resolution
Apply a mild sharpen after big downscales
Test one image before processing the whole batch

Pro tips

Resize before uploading to a CMS — most blogs don't need anything wider than 1600 px.
WebP at 85% quality usually beats JPEG at 90% on file size while looking identical.
Use the same target size for an entire gallery so your CSS grid stays predictable.
When aspect ratio is locked, the box defines the maximum — portrait and landscape photos both fit cleanly.
For social uploads, resize to the exact platform spec rather than relying on automatic compression.

Expert insights

💡 Pro Tip: Keep originals

Always keep a copy of the source folder — resizing is destructive and a future redesign may need bigger images.

💡 Pro Tip: WebP first

If your destination supports WebP, choose it. You'll save 25–35% on file size at identical quality, which speeds up your site noticeably.

💡 Pro Tip: Sharpen after

Browser bicubic is good but slightly soft. A 0.5 px unsharp mask after a big downscale restores perceived sharpness.

Limitations to be aware of

Removes EXIF and metadata
Bicubic resampling, not bicubic-sharper
JPEG output is baseline (not progressive)
Very large batches are bounded by browser RAM
No animated GIF / WebP support — first frame only
Single output size per run — re-run for additional sizes

Frequently asked questions

Is there a file or batch size limit?: There is no hard server-side limit because nothing is uploaded — everything runs in your browser. Practical limits depend on RAM: most laptops handle 200–500 photos at 4–12 MP without issue. For very large folders, resize in chunks of 100.
Will the tool stretch my images?: Only if you turn off 'Maintain aspect ratio'. With aspect ratio locked (default), the longer dimension is fit inside the target box and the other is calculated automatically — no distortion.
What format should I pick?: WebP if your destination supports it (every modern browser, every modern CMS) — it cuts JPEG size by 25–35% at the same visible quality. JPEG for maximum compatibility with older tools. PNG only when you need transparency or perfectly lossless output.
Does this re-compress my photos?: Yes. Resizing requires re-encoding, which is lossy for JPEG and WebP. Pick a quality of 90% or higher to keep visual loss imperceptible; below 70% you'll see compression artefacts on smooth gradients and skin tones.
Are EXIF and metadata preserved?: No. The browser Canvas pipeline used by this tool strips EXIF when re-encoding. If you need to keep camera metadata (date, GPS, lens), use a desktop tool such as ExifTool after resizing, or run our metadata-editor first to copy tags.
How is privacy handled?: Every operation runs in your browser using the Canvas API. No image bytes leave the device — safe for client photos, internal documents and unreleased product shots.
Can I download files individually?: Single uploads download directly. For batches, the tool packages everything into a ZIP because most browsers throttle or block more than one download at a time.
Why does the output look softer than I expected?: Big downscales (4000 → 800 px) lose detail by definition. The tool uses the browser's high-quality bicubic resampler, which is good but not as sharp as Photoshop's bicubic-sharper. Apply a 1-pixel unsharp mask after resizing for print-quality results.

Browse all PikDraw image tools →