Frequently Asked Questions

No. After the initial page load, all features work offline thanks to the service worker. PDFs are processed locally, so you can annotate files on flights or in low-connectivity environments.

Ultra PDF Editor works with standard PDF 1.3–2.0 documents, including forms and PDFs generated by scanners. Future updates will add PDF/A validation and optimization.

Files up to 40 MB load reliably in modern browsers. Larger files may work but consume more memory. Consider splitting very large documents before uploading.

Password-protected PDFs that allow document changes load normally after you enter the password. Owner-locked PDFs that disallow modifications cannot be saved, and the editor will warn you before export.

No. The original ArrayBuffer stays untouched. Exports generate a new file with the suffix -annotated so the source document remains unchanged.

Yes. Use the browser's "Install" or "Add to Home Screen" option to install the PWA. The installed app caches all static assets for offline use.

Real-time collaboration is on the roadmap for a future paid tier. The initial release focuses on private, single-user workflows.

Chrome, Edge, Safari, and Firefox released in 2023 or later. Mobile Safari on iPadOS 16+ works well for Apple Pencil signatures.

No. PDFs never leave your device. We do not run servers or collect telemetry that references file contents.

Minor updates ship monthly with bug fixes and performance tweaks. Major feature releases arrive quarterly and are documented in the Release Notes.

Double-click the text box to re-enter edit mode. You can change the content, color, font size, and styling, then click outside the box to save.

Yes. Click and drag a text box or rectangle to reposition it. Freehand strokes can be redrawn quickly using undo and redraw.

Select the annotation, press `Cmd/Ctrl + C`, navigate to the target page, then press `Cmd/Ctrl + V`. Duplication support is coming to the UI soon.

Highlight colors respect the style picker. You can choose predefined swatches or supply a custom hex value for consistent branding.

Highlights intentionally render at 35% opacity so underlying text remains legible in print and digital formats.

Yes. Redactions flatten to solid black rectangles and delete the underlying text and vector data during export.

Image annotations are planned. For now, convert logos to PDF fragments and merge them before editing, or paste them as raster images using external tools.

Yes. Comment pins and side panels are on the roadmap to enable structured review workflows.

Snap-to-grid controls are planned for v1.2. Until then, use zoom levels of 150% for precise alignment.

Not yet. Pointer events normalize pen input. We are evaluating PointerEvent pressure support for stylus devices in an upcoming release.

The editor displays an error banner and keeps annotations in memory. Try exporting again or downloading the raw JSON annotation data (coming soon) for support.

Exports always flatten the full document. Delta exports are on the roadmap for integration with document-management systems.

Yes. Ultra PDF Editor copies document outlines, metadata, and permissions flags from the source PDF into the annotated output.

Absolutely. Use the export dialog’s rename field (coming soon) or rename the downloaded file in your operating system.

Yes. Helvetica variants embed directly in the PDF to ensure text annotations render consistently across viewers.

Internal and external links remain intact because Ultra PDF Editor reuses the original page structure when writing annotations.

PDF/A-2b export compliance is under investigation. Today’s output is standard PDF 1.7.

Yes. All annotations flatten by default. A future toggle will allow retaining editable annotations for collaborative reviews.

Open the exported PDF in Acrobat or Preview and try selecting the redacted area. The text will be gone, indicating a successful redaction.

No. The app does not include analytics scripts. Future telemetry hooks will be opt-in and privacy preserving.

Yes. Use your browser’s Clear Site Data option or click “Reset workspace” in the forthcoming Settings panel to purge caches.

No. Ultra PDF Editor is a static site deployed on Cloudflare Pages. We have no backend infrastructure to receive or store documents.

The Content-Security-Policy allows `worker-src blob:` and `self`, preventing third-party scripts from executing. The worker bundle ships with Subresource Integrity hashes in future updates.

Yes. Switch to an incognito/private window. Assets load fresh each session and vanish when the tab closes.

Audit logging is planned for enterprise tiers. It will remain client-side and exportable as JSON for compliance workflows.

Cryptographic digital signatures (PKCS#7) are on the roadmap. Today’s signatures are visual only.

The project is designed for static hosting. You can deploy the build output to your own CDN or static hosting provider with minimal configuration.

CSP headers live in the `_headers` file. Updates roll out automatically with each Cloudflare Pages deployment.

None. The PWA works without notifications, location, or camera access. Browser prompts appear only when you install it.

The pdf.js worker and pdf-lib library are heavy. They load lazily only when you open the editor. Future code-splitting will trim the bundle further.

Close unused tabs, work with zoom levels under 200%, and avoid extremely large PDFs. The editor automatically throttles rendering to stay responsive.

No. Dark mode toggles CSS variables only. Rendering speed remains the same.

pdf.js streams one page at a time. Navigation remains responsive, but initial load may take longer. Consider splitting very large documents.

Canvas rendering relies on the browser’s graphics pipeline. Ensuring hardware acceleration is enabled in your browser settings improves panning and zooming.

Yes. Stick to smaller PDFs (under 25 MB) and close other apps to keep memory usage low. The editor is optimized for 4 GB RAM devices.

Strokes downsample using quadratic smoothing and flush to the DOM in batches to maintain 60 fps on modern hardware.

Yes. The roadmap includes exploring pdf.js’s WebAssembly backend for faster parsing on large files.

On OLED screens it can marginally reduce power usage, but the difference is minor compared to CPU-bound tasks like PDF parsing.

Service worker updates precache new assets in the background. Users receive a reload prompt, ensuring they stay on the fast, cached version without manual intervention.