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Best Resolution Converter Apps

203+ iOS apps curated and reviewed

4.6 avg rating
18 free apps
Updated May 2026

If you already know PDF Photos, this is the deeper bench. 203+ resolution converter apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of May 2026.

Top Picks for Resolution Converter

PDF Photos#1

PDF Photos by Sarrada Software Inc

Picture to PDF Converter
Editor's Choice
💼 Business
4.8😐(14K ratings)
FreeAdsIn-App Purchases
PDF Photos screenshot 1
PDF Photos screenshot 2
PDF Photos screenshot 3
PDF Photos screenshot 4
PDF Photos screenshot 5
PDF Photos screenshot 6

Easily convert your photos into professional-looking PDFs. Customize layouts, add branding elements like headers and footers, and control file size for efficient sharing. Save and share your documents across various cloud services or directly via email and printing.

What We Love

  • 🚀 Easy to use
  • 👍 Convenient for converting photos to PDFs
  • 🚀 Quick and efficient
  • 👍 User-friendly interface

Room to Improve

  • 🔒 Requires paid subscription to access full features
  • 🐛 Crashes or freezes on some devices
  • 🔒 Deceptive about free version capabilities
Conversion Calculator Plus#2

Conversion Calculator Plus by Yan Liong Tan

Unit Converter
Strong Contender
📊 Productivity
4.7😞(15K ratings)
FreeAdsIn-App Purchases
Conversion Calculator Plus screenshot 1
Conversion Calculator Plus screenshot 2
Conversion Calculator Plus screenshot 3
Conversion Calculator Plus screenshot 4
Conversion Calculator Plus screenshot 5
Conversion Calculator Plus screenshot 6

This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.

What We Love

  • 🚀 Great app
  • 👍 Easy to use
  • 🚀 Comprehensive conversions
  • 👍 Intuitive interface

Room to Improve

  • 🐛 Consent required for tracking
  • 🐛 Update problems
  • 🐛 Currency not updating
Unit Converter - Pro Units App#3

Unit Converter - Pro Units App by Tue Nguyen Minh

Convert Any Unit
Worth Considering
🔍 Reference
4.6😞(16K ratings)
FreeIn-App Purchases
Unit Converter - Pro Units App screenshot 1
Unit Converter - Pro Units App screenshot 2
Unit Converter - Pro Units App screenshot 3

This app offers a powerful and user-friendly unit converter with 16 categories, including currency, length, and temperature. It allows for custom unit lists and provides live exchange rate updates for 148 currencies. Unlock all features with a one-time in-app purchase.

What We Love

  • 👍 Easy to use
  • 🚀 Simple design
  • 👍 Covers many units
  • 👍 User-friendly layout

Room to Improve

  • 🔒 Limited functionality without paying
  • 🔒 Most common units locked behind paywall
  • 🐛 Restore purchase not working

More Resolution Converter apps to explore

4
Convertible: Unit Converter
Convertible: Unit Converter
Convertible: Unit Converter
Currency and Unit Converter
Free

This app offers a comprehensive unit and currency conversion tool with a visually appealing interface and extensive unit options. It supports standard and non-standard units, compound conversions, and fraction input, making it versatile for various needs.

Extensive standard and non-standard unit conversionsCurrency conversion with 161 currenciesCompound unit conversion
🔧 Utilities
(97)
paid
5
Image Converter - PNG&PDF&JPEG
Image Converter - PNG&PDF&JPEG
Image Converter - PNG&PDF&JPEG
Convert to JPG PNG & SVG File
Free

Easily convert images between popular formats like JPG, PNG, and PDF. Batch convert files, including iPhone's HEIC, with adjustable compression. Includes basic editing tools for cropping, rotating, and resizing.

Supports JPG, PNG, WEBP, GIF, BMP, TIFF, HEICBatch conversionAdjustable compression settings
🌟 Lifestyle
(26)
ad-supported
6
Units Plus Converter
Units Plus Converter
Units Plus Converter
Convert Any Unit & Currency
$19.99

Easily convert between various units and currencies with a simple, intuitive interface. Features live currency updates for 155 world currencies, refreshed every 15 minutes. Optimized for a wide range of Apple devices, including iPads with Split View support.

Unit conversion across 12 categoriesLive currency updates for 155 currenciesOptimized for iPhone and iPad
🔧 Utilities
(8.3K)
free
7
Video Converter - Compressor
Video Converter - Compressor
Video Converter - Compressor
Trim Merge Reverse Thumbnail
Free

Easily convert videos to various formats or extract audio. This tool offers compression, trimming, merging, and rotation features with support for numerous input and output file types. Local conversions are fast and do not require an internet connection.

Video conversion to multiple formatsVideo compressionVideo trimming and merging
🔧 Utilities
(18)
free with in-app purchases
8
Photo & Image Converter
Photo & Image Converter
Photo & Image Converter
Resizer & convert files bulk
Free

Easily convert and resize images and files on your iOS device. Supports a vast array of formats for both online and offline conversions, with batch processing capabilities. All converted files are conveniently saved in Apple's Files app.

Image conversionFile conversionImage resizing
📊 Productivity
(491)
free with in-app purchases
9
Fancy Units Converter
Fancy Units Converter
Fancy Units Converter
Currency and Unit Converter
Free

This app offers a fast and user-friendly way to convert units and currencies. Customize your conversion lists and get instant results as you type, with support for over 350 units and 160 currencies. It also includes a built-in calculator and offline currency data.

Real-time conversion350+ physical units160+ currencies
🔧 Utilities
(1.6K)
free with in-app purchases
10
Converter-Universal Conversion
Converter-Universal Conversion
Converter-Universal Conversion
by Trelleborg Sealing Solutions
Free

This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.

Currency converter with live exchange ratesOver 300 engineering and scientific unitsSpecialized hardness converter
🔧 Utilities
(897)
free
11
AllConvert Kit - Image & Video
AllConvert Kit - Image & Video
AllConvert Kit - Image & Video
Convert to PNG, GIF, PDF+more
Free

Easily convert your files to a wide range of formats including documents, ebooks, images, audio, and video. This app handles your media conversion needs quickly and securely, with files deleted from servers within 24 hours.

Document conversionEbook conversionImage conversion
🔧 Utilities
(1.3K)
free with in-app purchases
12
Resolutioner
Resolutioner
Resolutioner
Calculate or scale resolutions
Free

This utility app helps you calculate and scale screen resolutions based on aspect ratios. Save and manage your frequently used resolutions for easy access. Sync your presets across Apple devices.

Calculate resolutions by filling in one sideEdit aspect ratios easilyScale resolutions up or down
🛠️ Developer Tools
(751)
free with in-app purchases
13
Video Converter and Compressor
Video Converter and Compressor
Video Converter and Compressor
Any Format Batch 4K Merger
Free

This app converts and compresses video and audio files into numerous formats. It also allows merging video and audio clips, changing resolution, frame rate, and bitrates. Files can be imported from various sources, including cloud services and local devices.

Convert video to any formatCompress video filesMerge video and audio clips
📷 Photo & Video
(2.1K)
free with in-app purchases
14
Measures Unit Converter
Measures Unit Converter
Measures Unit Converter
Unit Converter
$1.99
$2.99 | 33% OFF

This app offers a comprehensive unit conversion tool with over 971 units across 40 categories, including 173 currencies with real-time exchange rates. It features an intuitive interface, a scientific calculator, and offline functionality, making it ideal for precise conversions.

971 units across 40 categories173 currencies with real-time ratesOffline conversion functionality
🔧 Utilities
(20)
free with in-app purchases
15
Unit Converter HD.
Unit Converter HD.
Unit Converter HD.
30 categories, 700+ units
Free

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

700+ Units of Measure30 Conversion CategoriesEasy-to-Use Interface
🔧 Utilities
(642)
free with in-app purchases
16
The Document Converter
The Document Converter
The Document Converter
Convert to PDF, DOCX, JPG, etc
Free

Effortlessly transform files into various document and image formats like PDF, DOCX, and JPG. Simply select your input, choose the desired output, and convert in seconds. Save, share, or open your converted files directly in other applications.

Convert to PDF, DOCX, JPG, TXT, and moreSupports dozens of input formatsSave, share, or open converted files
🔧 Utilities
(5.9K)
freemium
17
Percentage Resolution Tool
Percentage Resolution Tool
Percentage Resolution Tool
by David Hobbs
Free

Easily convert pixel values to percentages and vice versa for screen dimensions. Supports coordinates and sizes, with multiple target screen sizes and orientation options. A lightweight and responsive tool for developers.

Pixel to percentage conversionPercentage to pixel conversionCoordinate and size support
📊 Productivity
(2)
free with in-app purchases
18
Currency & Unit Converter #
Currency & Unit Converter #
Currency & Unit Converter #
Scientific Unit Converter
Free

This app offers a comprehensive solution for converting units across more than 20 common categories, including over 400 units. It supports mixed units and currency exchange with real-time updates, making it useful for work, study, and daily life. The app features a scientific calculator and a user-friendly interface.

20+ Categories & 400+ UnitsMixed-Unit SupportCurrency Exchange
🔧 Utilities
(217)
free
19
Image Size
Image Size
Image Size
Resize your photo! Resizer App
Free

Easily resize your photos to any dimension using pixels, millimeters, centimeters, or inches. Preserve aspect ratio with a simple tap and crop images with intuitive multitouch gestures. Save, email, print, or share your resized creations.

Resize images to custom dimensionsSupport for pixels, millimeters, centimeters, and inchesPreserve aspect ratio
📷 Photo & Video
(30K)
free with in-app purchases
20
Image Converter: JPEG PDF HEIC
Image Converter: JPEG PDF HEIC
Image Converter: JPEG PDF HEIC
Convert to JPG PNG & SVG File
Free

Easily convert images to over 20 formats like JPG, PNG, PDF, and SVG. This app offers a user-friendly interface for efficient media management, making it simple to prepare photos for professional use or sharing.

Convert to 20+ image formatsSupports JPEG, PNG, PDF, SVG, HEICUser-friendly interface
📊 Productivity
(9K)
subscription

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