Find quick answers to common questions about tools, security, and formats.
Yes! All PDF and image utilities on PDF Studio are 100% free. You can merge, split, compress, convert, watermark, and sign documents without any subscription fees or credit cards.
No registration is required. You can use any tool immediately as a guest. Free registered accounts enjoy higher daily quotas and saved preferences.
Guests have standard daily conversion limits. Free registered users receive higher file size allowances and unlimited daily operations.
Yes. PDF Studio uses a local browser-side architecture. Documents are processed in your device’s memory via WebAssembly and JavaScript, meaning files are never stored permanently on our servers.
Files are never stored on our server disks. When you close or refresh your browser tab, all temporary memory buffers are destroyed automatically.
Protect PDF adds password encryption required to open the document. Flatten PDF permanently bakes form fields, signatures, and annotations into the page background so they cannot be altered.
Our compression tool removes redundant metadata streams, optimizes font descriptors, and downsamples embedded images to achieve smaller file sizes while keeping text sharp.
In our Add Page Numbers tool, select your preferred position, numbering format, and check "Skip Cover Page" so numbering begins on Page 2.
If you know the password of a locked PDF, our Unlock PDF tool verifies it, removes the encryption dictionary in browser memory, and produces a clean, permanently unlocked document.
In recruitment portals (like Teletalk/Gov jobs in Bangladesh), signatures must be exactly 300x80 px under 60 KB. Our tool provides interactive sliders and compression to generate compliant JPEGs in seconds.
Upload the front photo in Slot 1 and back photo in Slot 2 of our NID in 1 Page tool. You can rotate photos, select Color or B&W photocopy mode, and download a print-ready A4 PDF.
Upload a single passport photo, choose your standard (35x45mm BD, Stamp size, or 2x2 inch Visa), and the engine creates a 4x5 grid of 20 copies on an A4 sheet with scissor-cutting lines.
Make sure your browser permits file downloads. Because files are generated locally in memory as Blob URLs, aggressive privacy extensions can occasionally block blob triggers.
Yes! PDF Studio is fully responsive and works across Android Chrome, iOS Safari, Samsung Internet, Edge, and Firefox.
Our support team is happy to assist with any questions or feature suggestions.
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