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Bulk Image Resizer & Converter

Batch resize images, convert to WebP/JPEG/PNG, add a text or logo watermark, rotate/flip, and download files individually or as a ZIP. Everything runs locally in your browser.

Resize & Convert Options

Quick presets
Applies to JPEG/WebP; PNG is lossless.

Tokens: {name} {w} {h} {ext} {i} (i = sequence number).

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TL;DR — bulk resize, convert, watermark, and zip in your browser

Drop your images, pick a preset or size, choose WebP/JPEG/PNG, add an optional text or logo watermark, then download individually or as a ZIP. No uploads, no tracking—everything runs locally.

Bulk Image Resizer & Converter – Batch Resize, Convert & Watermark Images Online

Resize multiple images at once online. Convert to WebP, JPEG, or PNG, add text or logo watermarks, rotate, flip, and download all processed images as a ZIP file — entirely in your browser, no uploads. This bulk image resizer is ideal for creators, social teams, product marketers, and engineers tidying assets before they ship.

Start with the size you need: keep aspect with Fit, pad to exact dimensions with Fill, or enforce consistent thumbnails with Crop (cover). Prefer simple scaling? Use Percent for quick downsizing or Long edge for mixed orientations. Export as WebP, JPEG, or PNG (or choose Auto — PNG if alpha, otherwise JPEG). Fine‑tune output with a quality slider, background color for padding, and optional rotate/flip transforms.

Watermarks are built in. Add a lightweight text mark or drop in a logo image; choose position (corners or center), adjust margin, opacity, and relative size, and you’re done. To keep filenames consistent across a campaign, use the template tokens ({name} {w} {h} {ext} {i}) and download everything as a single ZIP.

Handy companions: need to turn a short link into a scannable graphic? Try the QR Code Generator. Working with payloads or signed URLs? The Base64 Encoder & Decoder helps you inspect tokens. Cleaning up copy for captions? Use Case Converter.

How to use the Bulk Image Resizer & Converter

  1. Upload your images
    Drag & drop or click to add multiple files. Use Select all/none, or pick items one by one.
  2. Choose a preset or mode
    Pick Square/Social presets or select Fit, Fill (pad), Crop (cover), Scale by %, Long edge, or Original (no resize). Lock proportion and prevent upscaling if you want to avoid soft results.
  3. Set format, quality, and options
    Export as WebP/JPEG/PNG (Auto uses PNG when alpha is present). Adjust quality, background color for Fill, rotate/flip, and add either a text or logo watermark.
  4. Process and download
    Process selected/all, then download individual files or a ZIP. Filenames follow your template tokens: {name} {w} {h} {ext} {i}.

Why convert images to WebP?

WebP delivers 25–35% smaller file sizes than JPEG or PNG at comparable visual quality. Smaller images mean faster page loads, lower bandwidth costs, and better Core Web Vitals scores (especially Largest Contentful Paint). Modern browsers — Chrome, Firefox, Safari, and Edge — all support WebP natively. For most web and social content, it is the best default output format.

When transparency is required, WebP still wins over PNG in most cases. Use PNG only when you need lossless pixel-perfect output or need to support very old software that does not accept WebP.

Guide

When to use which mode: choose Crop when every image must be exactly the same visible size (e.g., product grids). Use Fit to preserve composition without padding. Pick Fill for hero areas that require precise dimensions and a background color. For mixed orientations, Long edge normalizes the longest side, while Percent gives you quick, proportional scaling across a set.

Quality & formats: WebP usually delivers the best size/quality ratio; JPEG is a good choice for photographic content when WebP isn’t required; PNG is ideal when you need lossless or transparency. If you’re unsure, start with WebP ~80% and adjust by eye.

Note: very large images or huge batches depend on your device’s memory (browser canvas limits). Exports focus on pixels and may not retain EXIF/metadata.

Key features

  • Resize in bulk: Fit, Fill (pad), Crop (cover), Percent, Long edge, or Original.
  • Convert to WebP/JPEG/PNG, or Auto (PNG if alpha, else JPEG).
  • Quality slider (1–100) and background color for padding.
  • Text watermark or logo watermark with position, size %, margin, opacity.
  • Square & social presets (IG post/portrait/story, YouTube thumbnail, X header, Facebook cover, LinkedIn, Pinterest).
  • Filename template tokens and ZIP download.
  • 100% in-browser — no uploads, no tracking.

Tips

  • Use WebP + quality 70–85 for big size savings with good perceptual quality.
  • Pick Crop (cover) for consistent thumbnails; Fit to preserve original aspect without padding.
  • Enable 'Don’t upscale' to avoid soft, blurry results on small originals.
  • For brand safety, add a semi-transparent logo watermark at 50–70% opacity.
  • Use Long edge for galleries where orientation varies; Scale by % for quick proportional downsizing.

Frequently asked questions

Does this upload my photos to a server?
No. Everything runs locally in your browser.
What’s the difference between Fit, Fill, and Crop?
Fit keeps aspect within your box (no padding). Fill pads to exact size with a background color. Crop covers the box and trims overflow for pixel-perfect thumbnails.
How do I compress images in bulk?
Choose WebP or lower the Quality slider, process, and download the ZIP. That’s the quickest way to bulk compress images.
Will metadata (EXIF) be preserved?
Exports focus on pixels; EXIF/metadata may not be retained in the output.
Is there a limit on image size or count?
It depends on your device and browser memory. Extremely large images or huge batches may hit canvas limits; process in smaller groups if needed.
How do I resize multiple images at once online for free?
Upload all your images at once (drag-and-drop or file picker), set the target dimensions or resize method (Fit, Fill, Crop, Percent, or Long edge), then click Process All and download the ZIP file. No account needed.
How do I convert images to WebP format in bulk?
Upload your JPG or PNG images, set the output format to WebP, adjust quality (70–85 is a good starting point), and click Process. Download all converted images as a ZIP file.
Can I add a watermark to multiple images at once?
Yes. Enable the watermark option, upload a logo or enter text, set position, size, and opacity, then process all images. Each image gets the watermark applied before download.

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