> ## Documentation Index > Fetch the complete documentation index at: https://withhalo.app/docs/llms.txt > Use this file to discover all available pages before exploring further. # Editing tools > Crop, redact, annotate, trim and more, before you save. Halo can fix a picture or a video before it saves it. Start dragging it, tap **Shift**, then tap **Alt** (⌥ Option on a Mac) for the tools ring, and let go over a tool. A small window opens right on the page. Everything happens in your browser: nothing is uploaded to edit it. **Save** applies your changes to the full-size original, not the smaller copy the page shows, and the file lands in `Downloads/Halo`. ## Pictures | Tool | What it does | | - | - | | **Crop** | Free, Original, 1:1, 4:5, 16:9 or 9:16. Drag the corners or edges, move the box, or drag a new one on the picture. Type an exact size in pixels. Turn and flip. | | **Edit** | Brightness, contrast, fade, saturation, vibrance and warmth. Hold **Original** to compare. | | **Redact** | Drag over what to hide, as solid colour or blur (pixelated first, so it can't be reversed). **Find text** marks every line of text for you. | | **Annotate** | Arrows, pen, text, boxes, circles, highlights and numbered steps, in five colours and three sizes. | | **Background** | Sets the picture on a colour or gradient, with padding, round corners and a shadow, at Fit, 1:1, 4:5 or 16:9. On a photo, choose the cut-out subject (Halo removes the background on your computer) or the whole picture. Saved as PNG. | | **Compress** | JPG or WebP, a quality and a size. Shows exactly what the file will weigh before you save. | **Crop** ![The Crop window: a puppy photo with a 4:5 crop box, the ratios, and the size in pixels](https://mintcdn.com/halo/MIkOdejx1qdpMNRt/images/tool-crop-light.webp?fit=max\&auto=format\&n=MIkOdejx1qdpMNRt\&q=85\&s=8981f901b45391a6c923e480f2678189) **Annotate** ![The Annotate window: an arrow (selected, with its handles), a circle and a numbered step on a photo](https://mintcdn.com/halo/MIkOdejx1qdpMNRt/images/tool-annotate-light.webp?fit=max\&auto=format\&n=MIkOdejx1qdpMNRt\&q=85\&s=d705a944cf9a33ebe13d21e4753bc1eb) **Redact** ![The Redact window: Find text has covered the postcard’s two lines in black](https://mintcdn.com/halo/MIkOdejx1qdpMNRt/images/tool-redact-light.webp?fit=max\&auto=format\&n=MIkOdejx1qdpMNRt\&q=85\&s=ce4aea5e782b32978ed545f0e071f46d) **Background** ![The Background window: the puppy, cut out on this computer, on a blue gradient with a shadow](https://mintcdn.com/halo/MIkOdejx1qdpMNRt/images/tool-background-light.webp?fit=max\&auto=format\&n=MIkOdejx1qdpMNRt\&q=85\&s=bb527c20c4260cbc242d2e8a631beb60) ### Changing what you've drawn In **Redact**, click a box to select it. In **Annotate**, pick **Select** (V) first, then click a mark. Once something is selected: * drag it to move it, or drag its handles to resize it (an arrow has one at each end); * click a colour, a size, or Solid / Blur to change it; * press ⌫ (Delete), or click the bin, to remove it; * use the arrow keys to nudge it by a pixel, or by 10 with Shift. Double-click a piece of text to change it. Something you've just drawn is already selected, so you can adjust it straight away. ## Video Video windows have their own player. The video on the page pauses while one is open, and goes back to where it was when you close it. | Tool | What it does | | - | - | | **Trim** | Drag the ends on the filmstrip, or type the times. Save that part as an MP4, a GIF (up to 30 seconds) or just the sound. Up to 10 minutes. Click inside the selection to move the playhead; drag it to move the whole selection. | | **Split** | Play to a moment and press **Split here**. Save the pieces as separate clips, or as one video. Double-click a piece to leave it out. | | **Speed** | 0.25× to 4×. Voices keep their natural pitch, or leave the sound out. | | **Compress** | The original height, 720p or 480p, and Best, Balanced or Smallest. Halo compresses a few seconds to show you about how big the file will be. | ![The Trim window: the video, a filmstrip with the part to keep selected, start and end times, and MP4, GIF or Audio only](https://mintcdn.com/halo/MIkOdejx1qdpMNRt/images/tool-trim-light.webp?fit=max\&auto=format\&n=MIkOdejx1qdpMNRt\&q=85\&s=9814f13e66a102e5e014abb38f67940d) The video tools save H.264 MP4s, which play everywhere (QuickTime included), starting exactly where you set them. The sound is copied as it is unless the speed changes. **Mute** (in the Save ring, no window) saves the video without its sound, with the picture untouched. ## In every window | | | | - | - | | **Undo / redo** | The arrows at the bottom left. ⌘Z and ⇧⌘Z on a Mac; Ctrl+Z and Ctrl+Y on Windows. | | **Bigger window** | The button at the top right makes the window as big as your screen allows. Click it again to go back. | | **Copy** | In Redact and Annotate: puts the full-size result on the clipboard, ready to paste into a chat or an email. The window stays open. | | **Save** | Or press Enter. | | **Esc** | One step at a time: it cancels the text you're typing, then lets go of what's selected, then closes the window. If you've changed something and not saved it, Halo asks before closing. | ## Keys in Annotate | Key | Tool | | - | - | | V | Select | | A | Arrow | | P | Pen | | T | Text | | B | Box | | O | Circle | | H | Highlight | | N | Number | ## Uses Opening a window is free. Saving or copying from it counts as one use, like any other save. See [Unlock Halo](/docs/guides/unlock.md). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.