Help
PDF Editor User Guide
Getting Started
Drag & drop PDF or click to select
The upload area is on the main page
Quick action buttons are also available:
Recently opened files are shown on the main page — click any to reopen.
Editor
After opening a file, you enter the editor with four zones:
Editor interface diagram
Top Panel
Navigation, zoom, undo/redo, search, download
Left Panel
Tools: merge, split, watermark, OCR
Drawing Panel
17 annotation tools, color, line width
Right Panel
Comments and page thumbnails. Collapse by clicking the active tab or the '>' button
Page Management (right panel → Pages)
Click — go to page
Ctrl/Cmd+Click — select/deselect individual pages
Shift+Click — select a range of pages
Drag — drag & drop to reorder
On hover — rotate and delete buttons on the thumbnail
When multiple pages are selected: rotate, delete, extract to PDF
Document Navigation
Middle mouse button (scroll wheel) — hold and drag to scroll in any direction
Left-click on gray background (between pages) — drag to scroll
Ctrl + wheel — zoom
Theme
Theme toggle in the top-right corner of the header. Selected theme is saved between sessions
Annotations
17 types of annotations available:
Text
Free text
Callout
Text with arrow
Pencil
Freehand drawing
Line
Straight line
Arrow
Line with arrowhead
Polyline
Multi-point line
Rectangle
Rectangular shape
Ellipse
Oval shape
Polygon
Multi-sided shape
Cloud
Jagged edges
Highlight
Semi-transparent area
Sticky Note
Sticky with text
Stamp
Approved, Rejected...
Image
PNG or JPEG with rotation, resize, and one-click background removal
Text Highlight
Marker
Underline
Line under text
Strikethrough
Line through text
Squiggly
Underline
How to add an annotation
Select a tool
On the drawing panel to the left of the canvas. The panel remembers the last tool in a group
Click or drag
On the PDF page where you want it
Double-click to finish
For polygon, polyline, and cloud
Callout — two clicks
First click — arrow point, second — text block
Escape to cancel
Press Escape to cancel unfinished drawing
How to edit
Selection mode
Switch to the arrow (first button)
Click on an annotation
Resize handles will appear
Drag or pull handles
To move and resize
Delete to remove
Removes the selected annotation
Comments and Author Name
Click on comment text in the right panel — edit. Ctrl+Enter — save
Double-click on author name — change name. The new name will apply to all your annotations and is saved between sessions
Text Markup
In Selection mode, select text with the mouse — a menu will appear:
PDF Tools
Merge
Upload multiple PDFs, arrange in the desired order ↑/↓ and merge
Split
Specify page ranges (1-3, 4-6, 7-15) — each becomes a separate PDF
Rotate
Click a thumbnail to rotate 90° or rotate all at once
Watermark
Customize text, color, size, opacity, and rotation angle
Extract Text
Get the text content of a PDF
Export to PNG
Save pages as images
OCR
Text recognition from scans (Russian, English)
Fill Form
Fill interactive PDF form fields
Insert image
Drop a PNG or JPEG anywhere on a PDF page. Move, resize, rotate, and optionally remove the background — all in your browser, no uploads.
📥 How to insert
Click the image icon in the annotation toolbar, then drag a file in, click to pick, or paste with Ctrl+V / ⌘V (works for screenshots too).
✂️ Remove background
Tick the checkbox in the dialog. The cut-out is computed locally with an ML model that's downloaded once (~25 MB) and cached for next time.
🔄 Rotation
Drag the circle handle above the image for free rotation. Click it (no drag) for a quick 90° turn. Snaps to 0/90/180/270° — hold Shift to disable snap.
📐 Resize
Drag any corner. Hold Shift to keep proportions. Side handles (n/e/s/w) stretch one dimension only.
🛡 Image processing — including background removal — runs entirely on your device. Files never leave the browser.
Keyboard Shortcuts
Keyboard shortcuts work in any layout (Russian, English, etc.)
Saving and Export
Autosave
Annotations are saved automatically — they survive F5 and tab close
Download PDF
Click 'Download' on the top panel — annotations are embedded in the file
Compatibility
Exported annotations are visible in Adobe Reader, Foxit, and others
Re-import
When opening a previously exported file, annotations load automatically
When Data Is Lost
Clearing browser cache
Deletes all saved files and annotations
Incognito mode
Data is not saved after closing the window
'Change file' without downloading
Annotations from the previous file will be lost
Different browser
Data is stored in a specific browser
Recommendation
Before closing, download the PDF with annotations — this ensures your work is preserved.
FAQ
Are files sent to a server?
Can I open different PDFs in different tabs?
Are annotations visible in Adobe Reader?
What formats are supported?
Is there a file size limit?
Privacy
PDF Editor runs entirely in your browser. Your files never leave your device.
What we collect
Anonymous usage metrics: which features are used, how long operations take, and error reports. No files, filenames, or annotation contents are ever transmitted.
What we never collect
Each installation is identified only by a random UUID stored in your browser. There is no user account.
Opt out
Disable anonymous telemetry. Your choice is persisted locally.