diff --git a/src/cmd_base58.rs b/src/cmd_base58.rs
index 82afca6..7dd442e 100644
--- a/src/cmd_base58.rs
+++ b/src/cmd_base58.rs
@@ -1,14 +1,39 @@
-use clap::Args;
-use rust_util::XResult;
+use std::io::Write;
+use base58::{FromBase58, ToBase58};
 use crate::CmdExec;
+use clap::Args;
+use rust_util::{opt_result, simple_error, XResult};
+use crate::util::read_file_or_stdin;
 
 #[derive(Debug, Args)]
 pub struct CmdBase58 {
-
+    /// Encode
+    #[arg(long, short = 'e')]
+    pub encode: bool,
+    /// Decode
+    #[arg(long, short = 'd')]
+    pub decode: bool,
+    /// Input file
+    #[arg(long, short = 'i')]
+    pub r#in: Option<String>,
 }
 
 impl CmdExec for CmdBase58 {
     fn exec(&self) -> XResult<()> {
-        todo!()
+        if self.encode && self.decode {
+            return simple_error!("Encode and decode cannot both assigned.");
+        }
+
+        let input = read_file_or_stdin(&self.r#in)?;
+
+        if self.decode {
+            let s = opt_result!(String::from_utf8(input), "Decode UTF8 failed: {}");
+            let decoded = opt_result!(s.from_base58(), "Decode base58 failed: {:?}");
+            std::io::stdout().write_all(&decoded)?;
+        } else {
+            let encoded = input.to_base58();
+            print!("{}", encoded);
+        }
+        Ok(())
     }
 }
\ No newline at end of file
diff --git a/src/cmd_base64.rs b/src/cmd_base64.rs
index 901e9b1..551ea90 100644
--- a/src/cmd_base64.rs
+++ b/src/cmd_base64.rs
@@ -1,12 +1,54 @@
+use crate::util::read_file_or_stdin;
 use crate::CmdExec;
+use base64::engine::general_purpose::{
+    STANDARD, STANDARD_NO_PAD,
+    URL_SAFE, URL_SAFE_NO_PAD,
+};
+use base64::Engine;
 use clap::Args;
-use rust_util::XResult;
+use rust_util::{opt_result, simple_error, XResult};
+use std::io::Write;
 
 #[derive(Debug, Args)]
-pub struct CmdBase64 {}
+pub struct CmdBase64 {
+    /// Encode
+    #[arg(long, short = 'e')]
+    pub encode: bool,
+    /// Decode
+    #[arg(long, short = 'd')]
+    pub decode: bool,
+    /// URL Safe
+    #[arg(long, short = 'u')]
+    pub url_safe: bool,
+    /// No pad
+    #[arg(long, short = 'P')]
+    pub no_pad: bool,
+    /// Input file
+    #[arg(long, short = 'i')]
+    pub r#in: Option<String>,
+}
 
 impl CmdExec for CmdBase64 {
     fn exec(&self) -> XResult<()> {
-        todo!()
+        if self.encode && self.decode {
+            return simple_error!("Encode and decode cannot both assigned.");
+        }
+
+        let input = read_file_or_stdin(&self.r#in)?;
+        let encoder = match (self.url_safe, self.no_pad) {
+            (false, false) => STANDARD,
+            (false, true) => STANDARD_NO_PAD,
+            (true, false) => URL_SAFE,
+            (true, true) => URL_SAFE_NO_PAD,
+        };
+
+        if self.decode {
+            let decoded = opt_result!(encoder.decode(&input), "Decode failed: {}");
+            std::io::stdout().write_all(&decoded)?;
+        } else {
+            let encoded = encoder.encode(&input);
+            print!("{}", encoded);
+        }
+        Ok(())
     }
 }
\ No newline at end of file