Photo editing guides
Each guide is a few minutes long and ends with the exact steps in Raspy. Everything described here runs in your browser, with no upload.
How to open and edit HEIC photos on Windows
HEIC photos from an iPhone will not open on many Windows PCs. Here is why, the three ways round it, and how to edit one in the browser without converting or uploading it.
4 min read
How to edit iPhone photos on an Android phone
HEIC photos sent from an iPhone often will not open on Android. How to open, edit and save them as JPEG in Chrome, with nothing uploaded and no app installed.
3 min read
How to remove location data from a photo before sharing it
Phone photos carry GPS coordinates, the capture time and the device model in EXIF metadata. When that matters, when apps strip it for you, and how to remove it in the browser without uploading the photo.
4 min read
How to edit photos online without uploading them
Most online photo editors send your photo to a server. Some run entirely in the browser. How to tell the difference, how to verify it yourself, and what an editor with no upload path looks like.
4 min read
How to fix a dark, underexposed photo
Brightening a dark photo with one slider washes it out. Which adjustments to use, in what order, and how far to push them before noise and grey blacks take over.
5 min read
How to crop a photo for Instagram: 4:5, 1:1, 9:16 and the grid
Instagram's feed, grid, stories and reels each want a different shape. The ratios and pixel sizes for each, how to crop to them before uploading so the app does not choose for you, and how to keep a portrait photo from being cut off.
4 min read
How to straighten a crooked photo
A tilted horizon is the most common flaw in a phone photo and the easiest to fix. How to straighten one precisely, what it costs you at the edges, and when to leave a tilt alone.
3 min read
Exposure vs brightness, highlights vs shadows: what each slider does
The iPhone Photos editor has seven light sliders that all seem to make the photo brighter. They do different things. A plain explanation of exposure, brilliance, highlights, shadows, contrast, brightness and black point, and when to reach for each.
6 min read
Saturation vs vibrancy: which one to use, and why skin cares
Both sliders make colour stronger. Saturation pushes every colour equally; vibrancy pushes the weak ones and protects skin tones. When each is right, plus warmth and tint for fixing colour casts.
4 min read
Convert HEIC to JPG in your browser, without uploading it
Most HEIC to JPG converters upload your photo to a server. This one decodes it on your device. Steps for desktop and phone, and what happens to quality and metadata.
3 min read
JPEG, PNG or WebP: which format to save a photo in
Three export formats, three different trade-offs. When JPEG is right, when PNG is worth the size, when WebP is the better JPEG, and which quality setting to use for sharing, printing and archiving.
4 min read
How to reduce noise in a grainy photo
Grain in low-light and night photos, what causes it, and how to smooth it with the Noise reduction slider without turning skin and fabric into plastic. Plus how sharpness and definition interact with it.
4 min read
Get the iPhone photo editing tools on a Windows PC
The iPhone Photos editor's adjustments are good, and they exist only on Apple devices. How to use the same fifteen sliders, crop and straighten on Windows, Linux or ChromeOS, in a browser, with iPhone HEIC files.
4 min read
Install Raspy as an app and use it offline
Raspy is a web app that installs to the home screen or desktop and runs without a connection. How to install it on iPhone, Android, Windows, Mac and ChromeOS, and what the offline cache does and does not hold.
3 min read