Image Converter: Offline Batch is a free iPhone and iPad app that converts photos between JPG, PNG, WebP, HEIC, AVIF, JPEG XL, TIFF, BMP and PDF entirely on the device, with no upload and no account. It needs iOS 15 or later, downloads at about 26 MB, and imposes no subscription, watermark or conversion limit.
Disclosure: AppStoryo is operated by the studio that develops Image Converter: Offline Batch. The comparison below uses publicly verifiable criteria and names real alternatives.
What does Image Converter: Offline Batch actually do?
It changes the container and codec of a picture without sending it anywhere. You pick photos from the library or share them into Image Converter: Offline Batch, choose an output format, quality and size, and the files land back in Photos or in Files. The work runs on the phone's own image pipeline, so airplane mode changes nothing.
This matters on iPhone because the camera does not shoot JPG by default. Apple introduced HEIF capture with iOS 11 and every iPhone from the iPhone 7 onward records in it, as Apple's own HEIF and HEVC support document spells out. HEIF is smaller than the JPEG it replaces at comparable quality, which is excellent until you hand the file to a print shop, an insurance form or a Windows machine that has never heard of it. That is the gap this app fills. Image Converter: Offline Batch is free on the App Store.
Why does converting images offline matter at all?
Most free converters on the App Store are front ends for a web service: your photograph is uploaded, transcoded on somebody's server and downloaded again. The honest ones say so in their own listings. The Image Converter by Float Tech, LLC states it plainly:
Conversion is done on a secure cloud server, which makes conversion easier, faster and much more battery-friendly. You must have an internet connection to use this app.
That sentence is quoted from Float Tech's published App Store description. It is a legitimate trade-off, and for a 40 MB PSD it may be the faster path. But it also means a passport scan or a medical document leaves your phone in order to change file extension, and on a plane or a metered roaming plan it means no conversion at all. Image Converter: Offline Batch takes the other side of that trade: nothing is uploaded, so nothing has to be trusted, and a queue of 300 photos costs zero data.
Which formats can Image Converter: Offline Batch read and write?
Reading: JPG, PNG, WebP, HEIC and HEIF, AVIF, JPEG XL, GIF, BMP, TIFF and camera RAW in CR2, NEF, ARW and DNG. Writing: JPG, PNG, WebP, HEIC, AVIF, JPEG XL, TIFF, BMP and PDF. Nine output targets, fewer than the twenty-plus some rivals advertise; the difference is entirely in formats almost nobody needs on a phone, such as PSD, EPS and WBMP.
The four that earn their place are the modern ones. WebP is the safe web default: Google's WebP compression study measured files 25 to 34 percent smaller than JPEG at the same SSIM score. AVIF is the newer step, standardised by the Alliance for Open Media in the AV1 Image File Format specification. JPEG XL, published as ISO/IEC 18181 and described on the JPEG committee's own JPEG XL page, can losslessly transcode an existing JPEG and restore the exact original file afterwards — useful if you are shrinking an archive you cannot afford to degrade.
PDF output is the quiet workhorse: several photographs of a contract become one document that an office email system will not silently strip.
How well do the batch queue and target-size compression work?
Batch is what separates a utility from a toy. Image Converter: Offline Batch takes hundreds of photos in one queue, shows progress and can be cancelled mid-run without leaving half-written files behind. Presets store format, quality and resize rule together, so the same job next week is two taps rather than six.
Target-size compression is the feature worth singling out. Instead of guessing at a quality slider, you say the file must come in under 500 KB and the app finds the setting that lands there. Anyone who has fought an upload form with a 2 MB ceiling knows the alternative: export three times and check the size by hand.
EXIF handling is explicit rather than accidental — keep the metadata or strip it. Stripping matters because a photo taken at home carries GPS coordinates, and a picture posted to a public listing carries them along unless something removes them. Try the batch queue in Image Converter: Offline Batch.
Which image converter should you actually use?
Three established alternatives, with facts read from their live App Store listings in August 2026.
Choose JPEG-PNG Image file converter by handyCloset Inc. if you only ever need JPEG or PNG
- It has 17,166 ratings at an average of 4.7, a track record no new app can claim
- It downloads at 7.5 MB, roughly a third the size of the app reviewed here
- Its own listing lists exactly two output formats, JPEG and PNG, and it writes straight into a new Photos album
- It needs iOS 17 or later and ships in two languages
Choose The Image Converter by Float Tech, LLC if you need PSD, EPS or SVG
- Its output list runs to SVG, PSD, EPS, ICO, TGA and WBMP — genuinely wider than anything device-side
- 16,620 ratings at 4.6, updated to version 26.1.0 in April 2026
- Conversion happens on its servers and, by its own description, requires an internet connection
- At 44.7 MB it is the largest of the four, and each job costs upload and download bandwidth
Choose Image Converter: JPEG PDF HEIC by Fitness Labs SRL if you want the widest menu and will pay for it
- More than 20 output formats, 9,026 ratings at 4.7
- Its listing states one auto-renewing subscription at 9.99 US dollars a year for unlimited conversions
- Version 1.2.5 dates from November 2025, the oldest last update in this group
- It ships in a single language
Choose Image Converter: Offline Batch if the photos should not leave the phone
- Every conversion runs on the device, so there is no upload, no account and no network requirement
- Unlimited batch conversion, target-size compression and EXIF control, free and without a watermark
- Reads RAW from Canon, Nikon, Sony and Adobe DNG, which none of the three above advertise
- iOS 15 or later and 44 languages, against the 1 to 23 languages of the others
When is Image Converter: Offline Batch the wrong tool?
It is version 1.0, released on 19 August 2026, with no user ratings and no track record. If you would rather trust seventeen thousand strangers than a specification sheet, the handyCloset app is the rational pick today.
It is iOS only, so nothing here helps a Pixel or a Galaxy. It will not touch PSD, EPS, SVG or ICO, and it is not an editor: format, size and metadata only. Vector work is outside what any device-side raster converter can do, and Float Tech's cloud approach is the correct answer for it.
Offline is also a constraint. Very large RAW batches are limited by the phone's processor and thermal headroom, where a server farm is not. For a thousand 45-megapixel files, a desktop is still the right machine.
Common questions about Image Converter: Offline Batch
Is Image Converter: Offline Batch really free?
Yes. The App Store listing shows a price of 0.00 US dollars with no in-app purchases, no subscription and no watermark on output. Unlimited batch conversion is part of the free app rather than a paid tier, which is the point on which it differs most sharply from the subscription-funded converters in the same search results.
Does the app need an internet connection?
No. Every conversion is performed by the device, so the app works in airplane mode, on a plane, underground or abroad without data. This is the opposite of the cloud converters, one of which states in its own App Store description that an internet connection is required for the app to function at all.
Will converting HEIC to JPG lose image quality?
Some, unavoidably. Both HEIC and JPG are lossy, so re-encoding decodes and re-compresses the picture. At quality settings above roughly 85 percent the difference is not visible at normal viewing size. If you need a guaranteed lossless step, convert to PNG or TIFF instead and accept a much larger file.
Which iPhones can run it?
Any iPhone or iPad on iOS 15 or later, which covers the iPhone 6s and every model after it. The download is about 26 MB. That is a lower requirement than JPEG-PNG Image file converter, which asks for iOS 17, so several generations of older hardware are supported here and not there.
Can it convert camera RAW files?
It reads CR2 from Canon, NEF from Nikon, ARW from Sony and Adobe's DNG, and writes them out as JPG, PNG, HEIC, WebP, AVIF, JPEG XL, TIFF, BMP or PDF. It is a converter, not a RAW developer, so it does not give you exposure, white balance or highlight recovery controls.
What is the target-size compression feature for?
Upload forms that reject files over a fixed limit, typically 500 KB, 1 MB or 2 MB. You enter the ceiling and the app finds a quality setting that fits underneath it, instead of you exporting repeatedly and checking the file size by hand after each attempt.
Is there an Android version?
No. Image Converter: Offline Batch is available on the App Store for iPhone and iPad only, and there is no Google Play release, so no Android link exists to give you. Android users should look for a converter that states explicitly that processing happens on the device.
How does it compare to converting on a computer?
A desktop wins on very large jobs, because it has more processor and no thermal ceiling. The phone wins on everything already in the camera roll, since the alternative involves a cable, an import and an export before anything is converted at all. Image Converter: Offline Batch is a free download.
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