Redact PDF Online – Hide Text in a PDF Permanently

Redact a PDF so the text is really gone

In most editors, drawing a black box over a name or an ID number leaves the words underneath untouched. Anyone can select the box, copy it and paste the hidden text somewhere else, and a search for the name still finds it. Jobsixo works differently. You mark the areas to hide, and every page you marked is re-rendered with the colour burnt into the picture. The text under it no longer exists in the file.

That is the difference between covering text and removing it, and it is the reason to redact a PDF with a proper tool before you send it to anyone. People use it to black out PDF details in bank statements, masked ID copies, contracts shared as samples, medical reports used as case studies, and resumes posted publicly.

How to hide text in a PDF permanently

1. 1
   Drop the PDF onto the box that says Drop the PDF to redact, or click to browse. The first page is drawn, and a short note tells you whether the file has selectable text or is a scan.
2. 2
   Drag a box over each piece of private information. Drag inside a box to move it, pull a corner grip to resize it, and use Delete area to remove the one you selected. Clear this page empties the page you are on, and Undo and Redo step through your changes.
3. 3
   Use the arrows to move to other pages. The line above the page shows how many areas sit on the current page and how many you have drawn in all.
4. 4
   If the same areas have to be hidden elsewhere, such as a header block on every page of a statement, open Repeat this page's areas on and choose Every page, or choose Chosen pages and type a list such as 2, 5-8.
5. 5
   Pick the Box colour. Black is the convention, and the colour only changes how the finished page looks.
6. 6
   Press Apply, which shows the number of redactions, for example Apply 3 redaction(s). A preview of the first redacted page appears under Check it before you download. Look at it, then press Download to save redacted.pdf.

What happens to the pages you redact

Each page that has at least one box is flattened. The page is drawn at 200 DPI, your boxes are painted onto that picture, and the picture is saved as a JPEG at 92 per cent quality inside a new page of the same size. Because the original text layer is not carried across, the covered words cannot be selected, searched or copied back out. Links and form fields on those pages are gone too, since the page is now a single image.

Pages you never marked are copied across exactly as they were, with their text still selectable, so the rest of the document stays searchable. The finished file is built as a new document, which means bookmarks and attached files from the original are not carried over. Its title, author, subject, keywords, creator, producer and date fields are also cleared.

A worked example with real numbers

Take an A4 page, 595.28 by 841.89 points. At 200 DPI the rendering scale is 200 divided by 72, or 2.78, so the page becomes a picture 1653 by 2338 pixels. Now draw a box that starts 10 per cent in from the left and 20 per cent down from the top, is 50 per cent of the page wide and 4 per cent tall. On the page that box is 297.6 points wide and 33.7 points high (about 105 by 12 mm), with its left edge 59.5 points from the left of the sheet. Because a PDF measures upward from the bottom, its lower edge sits 639.8 points above the foot of the page. In the rendered picture it covers a block 827 by 94 pixels starting 165 pixels from the left and 468 from the top.

A box can never be tiny by accident. Anything smaller than 1.2 per cent of the page in either direction is treated as a stray click and discarded, so a box that vanishes has been dropped for being too small.

How the repeat option decides where boxes go

Boxes belong to the page they were drawn on. The repeat setting takes the boxes on the page you are looking at when you press Apply and copies them onto every page, or onto the pages in your list. Boxes you drew on other pages stay where you put them.

That makes order important. If an account number sits in the same corner of all 12 pages, draw it once on page 1. Draw the boxes that belong to single pages on their own pages first. Then go back to page 1, leave Repeat this page's areas on set to Every page, and press Apply while page 1 is showing. Only the boxes on the page in view are repeated, so a box meant for one page alone should not be on it.

Redacting a scanned ID copy or statement

Suppose you have a scanned identity document and the office wants the number masked. Upload it, and the note above the page will say that the PDF has no text layer and is a scan. That changes what redaction promises: the covered areas are painted out of the picture, so nothing underneath is recoverable, but there was never any hidden text to remove.

A 12-digit number is usually printed as three groups of four. To leave only the last four digits visible, cover the first two groups, which is 12 minus 4 = 8 digits. Check every other place the number appears on the sheet, such as a second printing, a barcode or a QR code, and cover those as well. Apply, check the preview, and download redacted.pdf.

A redacted scan is a picture on a page like the original, so if the receiving portal has a size limit you can reduce its file size as the last step.

How to know a PDF redaction really worked

After you press Apply, check three things. First, look at the preview of the first redacted page under Check it before you download; it is produced by the same code that writes the file, so it cannot differ from the result. Second, download the file, open it in a viewer, and try to select and search for the words you covered. Nothing should highlight and the search should find no match. Third, scroll through the rest of the document, because the tool covers only the areas you drew.

For a stricter check, compare two PDF files, the original and the redacted copy. Only the areas you meant to hide should show as changed.

Redact a PDF free and in your browser

The whole job runs on your own device. The page is rendered by pdf.js, painted on a canvas and assembled into the new PDF by pdf-lib, all inside the browser tab. Your PDF is not uploaded to a Jobsixo server, there is no account to create and no watermark is added. That matters most for exactly the files people redact: contracts, bank statements, ID scans and resumes.

When to use a PDF redaction tool

• ID numbers, account numbers and addresses in documents you are submitting. Many offices ask for a masked Aadhaar copy that shows only the last four digits.
• Names and figures in a contract before it is shared as an example.
• Phone numbers and personal details on a resume you are posting publicly.
• Patient names in a medical report used for teaching or a case study.
• Salary, rent or balance figures on a statement that you are using as proof of something else.
• Confidential lines in a report that has to go to a wider audience.

Tips for a thorough redaction

• Before you start, search the original in your viewer for each name or number. Note every page where it appears, including headers, footers and tables.
• Use the repeat option for anything that sits in the same place on every page, such as an account number printed in a header.
• Draw boxes a little larger than the text. A box that stops exactly at the edge of the letters can leave a descender or a tail showing.
• If you only need to share part of a document, consider sending just those pages instead. You can extract the pages you need and redact those.
• Keep the original in a safe place and share only the redacted copy. After you finish, add a password if the file will travel by email.

Mistakes that defeat a redaction

• Hiding only the first occurrence. A name that appears on pages 1, 4 and 9 must be covered on all three, because pages you did not mark keep their text.
• Believing that a black highlight, a shape or a white rectangle from another editor removed anything. It usually did not.
• Cropping a page to hide a section. The crop tool only hides the trimmed area, and it can be reset.
• Forgetting that the original still exists. An email you already sent, or a copy in a cloud folder, still contains everything.
• Compressing or converting the file and assuming the words returned. They cannot come back, but a figure you did not cover can still be found.

Limits you should know about

You draw each box by hand. There is no search-and-redact that finds a name or pattern for you. The file may be up to 100 MB and 500 pages, and a password-protected file is refused with a prompt to unlock the PDF first. Redacted pages are fixed at 200 DPI, so they are pictures: sharp for reading, but not searchable, and a page that was a few kilobytes of text can grow a good deal as an image. Compress the result afterwards if the size matters.

Redaction removes content from this copy only. If the original has already been emailed or uploaded somewhere, those copies still hold the full text. If the file is a scan, the areas you cover are painted out of the picture, which is permanent, but nothing in a scan was searchable to begin with.