A privacy-first converter that covers the formats an iPhone owner actually meets — HEIC, RAW, WebP, AVIF, JPEG XL and PDF — without sending a single file to a server. Target-size compression and an unlimited batch queue are the features that make it a working tool rather than a demo, and the price is zero. The missing pieces are vector and PSD output, an Android build, and any user history at all: it shipped on 19 August 2026 at version 1.0.
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.
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
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.
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:
PDF output is the quiet workhorse: several photographs of a contract become one document that an office email system will not silently strip.
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.
Three established alternatives, with facts read from their live App Store listings in August 2026.
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
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
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
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
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.
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.
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.
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.
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.
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.
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.
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.
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.
Every conversion runs on the device, with no upload and no account
Reads RAW from Canon, Nikon, Sony and Adobe DNG
Writes WebP, AVIF and JPEG XL alongside the usual JPG, PNG and PDF
Unlimited batch queue with progress and cancel
Compress to a target file size instead of guessing at a quality slider
Free with no subscription, advertising or watermark
Version 1.0 with no user ratings and no track record
iOS only — no Android release
No PSD, EPS, SVG or ICO output
Not an editor: no cropping, retouching or colour work
A privacy-first converter that covers the formats an iPhone owner actually meets — HEIC, RAW, WebP, AVIF, JPEG XL and PDF — without sending a single file to a server. Target-size compression and an unlimited batch queue are the features that make it a working tool rather than a demo, and the price is zero. The missing pieces are vector and PSD output, an Android build, and any user history at all: it shipped on 19 August 2026 at version 1.0.