How-to · Images
How to batch convert images in Chrome
結論から言うと
Open Image Converter's popup, pick the target format and quality, then drop all the files at once — up to 80 files or 400 MB per batch. Each image is converted locally and the results come back as a single ZIP. Batch is a Pro feature (one-time purchase); single images are free.
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Install Image Converter and unlock Pro (one-time purchase) — batch conversion is a Pro feature.
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Open the popup with the toolbar icon or Ctrl+Shift+Y.
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Pick the target format and quality — they apply to every file in the batch.
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Drag all the images into the drop zone: up to 80 files or 400 MB per batch.
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Watch the progress as each file converts locally, then save the single ZIP (or one merged PDF, if PDF is the target).
The single-image workflow falls apart the day someone hands you a folder: forty product shots in WebP that the shop system wants as JPG, or a directory of PNG screenshots that need to shrink before they go in a report. Upload-based batch converters meet that moment with file-count caps, size caps and a queue — plus the small matter of your entire folder sitting on their server. Image Converter does the batch in Chrome itself: every file is converted on your machine, and the results come back as one ZIP.
The honest part first: batch is Pro
Free users convert one image at a time (JPG, PNG, WebP — no account, no limits on how often). Dropping multiple files is a Pro feature, unlocked with a one-time purchase rather than a subscription, and the popup and right-click menu both label it Batch convert… (Pro) up front. Pro also adds AVIF and JXL as targets — useful in batch, where the savings multiply across every file; see the AVIF guide.
Set the format first, then drop everything
Open the popup (Ctrl+Shift+Y), choose the target format and quality — those settings apply to the whole batch — then select or drag all the files into the drop zone at once. More than one file automatically means ZIP output: each image is converted in turn with a progress indicator, then packed into a single archive, so you're not clicking through eighty download prompts.
Know the limits — they're yours, not a server's
A batch takes up to 80 files or 400 MB; bigger jobs just get split into a second run. Notice what's absent: no per-file size cap negotiated with a stranger's server, no “upgrade for files over 5 MB”. The constraint is your own machine's memory, because that's where all the work happens — a 300 MB batch converts without a single byte leaving your browser, and it works with the network disconnected.
Batch into a single PDF instead
Pick PDF as the target format and the same drop converts every image and merges them into one PDF document instead of a ZIP — scans into a single file, screenshots into a shareable report. That's also Pro; if images-to-PDF is the only thing you need, our free combine images into one PDF guide covers a no-cost way.
Either way, the privacy claim stays testable rather than promised: run a batch offline and watch it behave exactly the same.