Help
Frequently asked questions
Direct answers about how PDF Logic handles your files, what the tools can and cannot do, and what to try when something goes wrong.
The basics
Is PDF Logic free?
Yes. All 46 tools are free, and you do not need an account or a subscription.
Each tool has a size limit, shown on its page before you choose a file. Tools that run in your browser usually open files of up to 50 MB, and tools that upload the file take up to 30 MB.
Do I need to sign up or install anything?
No. PDF Logic works in a current version of Chrome, Edge, Firefox or Safari, on a computer, tablet or phone. Open a tool, choose your file and download the result.
Your browser also saves the tools you open. A tool that runs on your device should keep working without an internet connection once you have opened it before, while tools that upload the file always need one.
Who runs PDF Logic?
PDF Logic is built and operated by Appzotech Enterprises Pvt Ltd, a software company founded in 2020. Its office is at A-65, 2nd Floor, Indra Park, Masudabad, Metro Pillar No. 91, Najafgarh, Delhi 110043, India.
How does PDF Logic pay for itself?
Appzotech pays for the servers and the work on the tools. You can support the project with an optional contribution, and nothing is held back if you do not.
PDF Logic does not show ads at the moment. If we introduce them, they will appear only on guide pages, clearly labeled, and never on a tool’s workspace.
Your files and privacy
Are my files uploaded?
It depends on the tool, and every tool page tells you before you choose a file. Of our 46 tools, 30 run entirely in your browser, so the file never leaves your device. Among them are Merge PDF, Split PDF, Organize PDF and Rotate PDF, along with most of the image tools.
Another 14 upload the file to our server, because the job needs software a browser cannot run. Compress PDF, PDF to Word, Word to PDF, Protect PDF and Redact PDF work this way. The remaining 2, the scanning and text-recognition tools, do part of the work on each side.
One exception is worth knowing. If your device cannot finish a very large job, Merge PDF, Crop PDF, Watermark, Sign PDF and JPG to PDF offer to run it on our server instead, and they upload nothing unless you choose that. JPG to PDF also asks before it uploads an image your browser cannot open, such as a TIFF.
What happens to a file after a server tool has finished?
The server keeps your file only while the job runs. Its temporary copies, and the result, are deleted as soon as the job finishes, including when the job fails.
What we do keep is a short technical record of the job: which tool ran, the file size, how long it took and whether it worked. It never includes the file name or contents, and it is deleted after 30 days.
Can I use PDF Logic for confidential documents?
For anything that must not leave your device, use one of the tools that runs in your browser, or desktop software.
Server tools send the file over an encrypted connection and delete it after the job, but it does leave your device. If your employer or client has rules about where documents may be processed, check them first.
Do you track me?
Not unless you allow it. Analytics are optional and stay off until you choose “Allow analytics”. You can change your mind at any time under Privacy choices, and every tool works the same either way.
Allowing analytics also turns on Google Analytics, which sets two cookies to tell your later visits apart. Without that choice, PDF Logic’s pages set no cookies. Your choice itself is remembered in your browser’s storage.
Using the tools
What is the largest file I can use?
PDF tools that run in your browser open files of up to 50 MB, and Merge PDF takes up to 100 files totaling 100 MB. Tools that upload the file, such as Compress PDF and the Office converters, take up to 30 MB, because one upload to our server can carry no more than that.
Image tools take images of up to 20 or 25 MB each, and Scan to PDF takes photos of up to 10 MB each. The exact limits are listed on each tool page. If your file is too large, split it into parts first.
Will compressing a PDF make it look worse?
It can, depending on what is in the file. Most of a large PDF’s size is images, and compression works mainly by saving those images at a lower resolution. Text stays sharp because it is stored as text, not as a picture.
Scanned PDFs are large because every page is one big image, so they shrink the most and also show the most change. Start with the recommended setting and check a page with small print. If you set a very small size limit, the tool may turn pages into images to reach it, which removes selectable text.
Why does my converted Word or Excel file look different from the PDF?
A PDF records where each character and line sits on the page. It does not record paragraphs, columns or table cells, so a converter has to work that structure out again. Simple one-column documents come through well. Multi-column layouts, merged table cells, text boxes and unusual fonts are where the result drifts.
If the PDF is a scan, there is no text in it at all until text recognition reads the page. Compare names, numbers and totals with the original before you use the converted file.
Can I edit the text in a scanned PDF?
Not directly. A scan is a photograph of a page, so there are no letters in the file to change. Edit PDF can add text, images and shapes on top of a scan, but it cannot rewrite the pictured words.
Run the file through OCR PDF first to make the text searchable and copyable. To rewrite it, convert the scan with PDF to Word in its “Extract text only” mode and edit the document there.
Does merging change my pages?
The pages are copied as they are, and their images are not recompressed. Bookmarks, links between pages and attached files come along. One thing does change: fillable form fields become ordinary page content, so the values stay visible but can no longer be edited.
Does Sign PDF add a digital signature?
No. Sign PDF places a visible signature on the page, much like signing a printout and scanning it. That is enough when the recipient only needs to see your signature on the document.
A certificate-based digital signature is different: it proves who signed and shows whether the file changed afterwards. If the recipient asks for one, you need a signing service or desktop software that works with digital certificates.
Can I remove a password from a PDF?
Yes, if you know the password. Unlock PDF opens the file with it and saves a copy without protection. It cannot recover or bypass a password you do not know, and it should only be used on files you are authorized to change.
Is covering text with a black box the same as redacting it?
No. A box drawn over text only hides it. The words are still in the file and can be found by searching or copying.
Redact PDF removes the content under the areas you mark. Afterwards, search the result for a word you removed to confirm it is gone.
When something goes wrong
A tool failed or seems stuck. What should I try?
First check the file against the limit on the tool page. If the PDF is password-protected, unlock it first, because many tools cannot open a locked file. If it will not open in any PDF reader, try Repair PDF.
Then run the job again. Large conversions and text recognition can take a while. If it keeps failing, tell us which tool you used and roughly how big the file was.
My browser froze on a large file. Why?
Tools that run in your browser use your device’s memory, and a long PDF with page previews can use a lot of it. Close other tabs, try again, and if you are on a phone, switch to a computer. Splitting the file into smaller parts first also helps.
The download did not start. Where is my file?
Look in your browser’s downloads list first, since many browsers save files without showing a prompt. If nothing is there, the browser may have blocked the download: look for a notice near the address bar and allow downloads from pdflogic.io. Then press the download button again.
How do I report a problem or a mistake in a guide?
Use the contact form or email hello@appzotech.com. For a tool problem, tell us the tool, what you expected and what happened. For a guide, send the address of the page and the step that was wrong.
Did not find your answer?
Write to the team, or read a guide that walks through the whole job step by step.