UnderLimit

Make a file fit. Keep it private.

UnderLimit creates smaller image and PDF copies on your iPhone. Choose a maximum in KB or MB, check the result, and share it when it meets your limit. Your originals stay unchanged.

IMAGES Choose a JPEG, HEIC or PNG still image from Photos or Files, or compress 2–10 images together. One maximum applies separately to each image. UnderLimit exports verified JPEG copies and clearly identifies any image that could not reach the requested size.

Inspect an original and its output before sharing. Switch between them with shared zoom and viewing position, or turn your iPhone sideways for a side-by-side comparison. Image previews are limited to 4096 pixels per edge; the files remain unchanged.

PDFs Make one supported PDF smaller, up to 100 pages and 100 MB. Set a maximum from 10 KB to 100 MB. UnderLimit checks the finished copy before making it available to share. Inspect every output page with page navigation, a page picker and zoom.

PDF compression creates a flattened visual copy. Searchable text, links, forms, annotations and interactive features are removed. Accessibility information may be lost, and the copy may not work with VoiceOver. Keep the original and review every page before using or sharing the result.

COMBINE DOCUMENTS Join 2–10 supported PDFs in your chosen order, up to 50 total pages and 100 MB of source files. Combine normally or set an optional maximum from 10 KB to 100 MB.

UnderLimit tries normal combining first. If the combined PDF exceeds your maximum, you can choose whether to try a smaller visual copy. An eligible document that cannot be combined normally may also offer visual conversion. Review the explanation and confirm before conversion starts. Visual copies remove searchable text and interactive features, and may not work with VoiceOver. Your originals stay unchanged.

A requested maximum is not guaranteed to be achievable. When a maximum is set, UnderLimit offers the finished PDF for sharing only after verifying that it is within that limit. Inspect every page before sharing, or adjust the limit while keeping your selected sources and order.

PRIVATE BY DESIGN Processing happens on your iPhone. No account, cloud processing, ads, behavioural tracking or subscription. One purchase, with no usage quota. You decide when and where to export a copy.

CLEAR LIMITS Not every file or target is achievable. UnderLimit reports unsupported inputs and size targets it cannot reach instead of offering an unchecked output. Encrypted and signed PDFs are not supported. Animated images and video are not supported.

A size target does not guarantee acceptance by another service. Always keep your original files and inspect exported copies.